[LoongArch64] Fix the GCReg update for the relocation case (pcalau12i + addi.d/ld.d) of NativeAOT, the GCReg should update after calculation completed. by LuckyXu-HF · Pull Request #132963 · dotnet/runtime

LuckyXu-HF · 2026-08-31T08:02:51Z

Fix the intermittent GC crash for NativeAOT test: SmokeTests/DynamicGenerics.

… + addi.d/ld.d) of NativeAOT, the GCReg should update after calculation completed. * Fix the intermittent GC crash for NativeAOT test: `SmokeTests/DynamicGenerics`.

azure-pipelines · 2026-08-31T08:03:43Z

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dotnet-policy-service · 2026-08-31T08:04:59Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

shushanhf

We had tested it OK on LA64 machine.
LGTM, thanks!

LuckyXu-HF · 2026-08-31T10:01:00Z

After #127595 checked the GC object stricter, it helps LA64 find an illegal case in nativeaot test ThreadLocalStatics.TLSTesting.ThreadLocalStatics_Test within DynamicGenerics:

intermittent GC crash of nativeaot test ThreadLocalStatics.TLSTesting.ThreadLocalStatics_Test

...
...
--------------------------------
Running Test: StaticsTests.TestStatics
Setting GC static
Calling GC.Collect
Verifying GC static wasn't collected erroneously
---- Test PASSED ---------------

--------------------------------
Running Test: ThreadLocalStatics.TLSTesting.ThreadLocalStatics_Test
Segmentation fault

It's because the GC safe point has a wrong offset:

backtrace at UnixNativeCodeManager::IsSafePoint()

...
...
   0x555555bc2010 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0>:    addi.d          $sp, $sp, -32
   0x555555bc2014 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+4>:    st.d            $fp, $sp, 16
   0x555555bc2018 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+8>:    st.d            $ra, $sp, 24
   0x555555bc201c <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+12>:    addi.d          $fp, $sp, 16
   0x555555bc2020 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+16>:    st.w            $a0, $fp, -4
   0x555555bc2024 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+20>:    st.d            $a1, $fp, -16
   0x555555bc2028 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+24>:    ld.w            $a0, $fp, -4
   0x555555bc202c <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+28>:    bstrpick.d      $a0, $a0, 0x7, 0x0
   0x555555bc2030 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+32>:    ld.d            $a1, $fp, -16
   0x555555bc2034 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+36>:    pcalau12i       $a2, 1242
   0x555555bc2038 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+40>:    addi.d          $a2, $a2, 1896  <--- error GC safe point
   0x555555bc203c <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+44>:    pcaddu18i       $t4, 0
   0x555555bc2040 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+48>:    jirl            $ra, $t4, 132   <S_P_CoreLib_System_Diagnostics_Debug__Assert_2>
   0x555555bc2044 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+52>:    nop
   0x555555bc2048 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+56>:    nop
   0x555555bc204c <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+60>:    ld.d            $ra, $sp, 24
   0x555555bc2050 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+64>:    ld.d            $fp, $sp, 16
   0x555555bc2054 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+68>:    addi.d          $sp, $sp, 32
   0x555555bc2058 <S_P_CoreLib_System_Diagnostics_Debug__Assert_0+72>:    ret
   0x555555bc205c <__start___managedcode+2330780>:    .word        0x00000000
...
...

(gdb) bt
#0  UnixNativeCodeManager::IsSafePoint (this=0x5555561e1e30, pvAddress=0x555555bc2038 <Assert+40>) at /data/xuliangyu/runtime/src/coreclr/nativeaot/Runtime/unix/UnixNativeCodeManager.cpp:412
#1  0x00005555558e1c5c in Thread::HijackCallback (pThreadContext=0x7ff7f8a29310, pThreadToHijack=0x7ff7f8a2b7e0, doInlineSuspend=true) at /data/xuliangyu/runtime/src/coreclr/nativeaot/Runtime/thread.cpp:699
#2  0x000055555597e48c in ActivationHandler (code=34, siginfo=0x7ff7f8a29290, context=0x7ff7f8a29310) at /data/xuliangyu/runtime/src/coreclr/nativeaot/Runtime/unix/PalUnix.cpp:1074
#3  <signal handler called>
#4  0x0000555555bc1f78 in Assert (condition=true, message=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Debug.cs:88
#5  0x0000555555c02c48 in GetUninlinedThreadStaticBaseForType (pModuleData=0x55555606fbb0 <__typemanager_indirection>, typeTlsIndex=3)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/ThreadStatics.cs:55
#6  0x0000555555c02bc8 in GetThreadStaticBaseForType (pModuleData=0x55555606fbb0 <__typemanager_indirection>, typeTlsIndex=3)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/ThreadStatics.cs:33
#7  0x0000555555b12d68 in get_CurrentManagedThreadIdUnchecked () at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Threading/ManagedThreadId.cs:249
#8  0x0000555555b1d18c in Exit (this=..., currentThreadId=8) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Lock.cs:320
#9  0x0000555555c339a4 in Dispose (this=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Lock.cs:189
#10 0x0000555555c9fc4c in TryGetDynamicGenericTypeForComponents (this=..., lookupData=..., runtimeTypeHandle=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/TypeLoaderEnvironment.ConstructedGenericTypesLookup.cs:238
#11 0x0000555555c9fc0c in TryGetDynamicGenericTypeForComponents (this=..., lookupData=..., runtimeTypeHandle=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/TypeLoaderEnvironment.ConstructedGenericTypesLookup.cs:238
#12 0x0000555555c9f9d4 in TryLookupConstructedGenericTypeForComponents (this=..., lookupData=..., runtimeTypeHandle=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/TypeLoaderEnvironment.ConstructedGenericTypesLookup.cs:206
#13 0x0000555555c9fab8 in TryLookupConstructedGenericTypeForComponents (this=..., genericTypeDefinitionHandle=..., genericTypeArgumentHandles=..., runtimeTypeHandle=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/TypeLoaderEnvironment.ConstructedGenericTypesLookup.cs:214
#14 0x0000555555c60c08 in TryGetConstructedGenericTypeForComponents (this=..., genericTypeDefinitionHandle=..., genericTypeArgumentHandles=..., runtimeTypeHandle=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.Reflection.Execution/src/Internal/Reflection/Execution/ExecutionEnvironmentImplementation.MappingTables.cs:183
#15 0x0000555555bbbf4c in GetRuntimeTypeHandleIfAny (genericTypeDefinition=..., genericTypeArguments=..., constructor=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/Runtime/General/TypeUnifier.cs:379
#16 0x0000555555bbbaf8 in GetRuntimeConstructedGenericTypeInfo (genericTypeDefinition=..., genericTypeArguments=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/Runtime/General/TypeUnifier.cs:340
#17 0x0000555555ba8654 in GetConstructedGenericType (genericTypeDefinition=..., genericTypeArguments=...)
    at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/Runtime/General/TypeUnifier.cs:72
#18 0x0000555555bb6198 in MakeGenericType (this=..., typeArguments=...) at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Reflection/Runtime/TypeInfos/RuntimeTypeInfo.cs:510
#19 0x0000555555a3f604 in MakeGenericType (this=..., instantiation=...) at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeType.NativeAot.cs:878
#20 0x00005555559981c4 in MakeType1 (typeArg=..., checkInitialization=false) at /data/xuliangyu/runtime/src/tests/nativeaot/SmokeTests/DynamicGenerics/threadstatics.cs:234
#21 0x000055555599eb54 in <MultiThreaded_Test>b__0 (this=...) at /data/xuliangyu/runtime/src/tests/nativeaot/SmokeTests/DynamicGenerics/threadstatics.cs:482
#22 0x0000555555b32abc in InnerInvoke (this=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2550
#23 0x0000555555c42a10 in <.cctor>b__302_0 (this=..., obj=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2538
#24 0x0000555555b1b904 in RunFromThreadPoolDispatchLoop (threadPoolThread=..., executionContext=..., callback=..., state=...)
    at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs:281
#25 0x0000555555b327d4 in ExecuteWithThreadLocal (this=..., currentTaskSlot=..., threadPoolThread=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2500
#26 0x0000555555b324a8 in ExecuteEntryUnsafe (this=..., threadPoolThread=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2434
#27 0x0000555555b323c8 in ExecuteDirectly (this=..., threadPoolThread=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2425
#28 0x0000555555b26a44 in DispatchWorkItem (workItem=..., currentThread=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolWorkQueue.cs:1104
#29 0x0000555555b26730 in Dispatch () at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolWorkQueue.cs:1006
#30 0x0000555555c3bc80 in WorkerDoWork (threadPoolInstance=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs:137
#31 0x0000555555c3baec in WorkerThreadStart () at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs:110
#32 0x0000555555eb1a54 in S_P_CoreLib_System_Threading_ThreadStart__InvokeOpenStaticThunk () at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/ValueTuple.cs:1008
#33 0x0000555555c2fee4 in RunWorker (this=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Thread.cs:90
#34 0x0000555555c2fd88 in Run (this=...) at /data/xuliangyu/runtime/src/libraries/System.Private.CoreLib/src/System/Threading/Thread.cs:57
#35 0x0000555555b17b90 in StartThread (parameter=140737353683312) at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Threading/Thread.NativeAot.cs:443
#36 0x0000555555b18450 in ThreadEntryPoint (parameter=140737353683312) at /data/xuliangyu/runtime/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Threading/Thread.NativeAot.Unix.cs:91
#37 0x00005555558e2ab4 in RhThreadEntryPoint (pContext=0x7ffff7f91170) at /data/xuliangyu/runtime/src/coreclr/nativeaot/Runtime/thread.cpp:1355
#38 0x00007ffff7d6e51c in ?? () from /usr/lib/loongarch64-linux-gnu/libc.so.6
#39 0x00007ffff7deb1f4 in ?? () from /usr/lib/loongarch64-linux-gnu/libc.so.6

ILC - System.Diagnostics.Debug:Assert(bool,System.String)

G_M57823_IG01:        ; offs=0x000000, size=0x0018, bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, BB02 [0001], byref, prolog, nogc
  0x7fbf7546e5b0            addi.d          sp, sp, -32
  0x7fbf7546e5b4            st.d            fp, sp, 16
  0x7fbf7546e5b8            st.d            ra, sp, 24
  0x7fbf7546e5bc            addi.d          fp, sp, 16
  0x7fbf7546e5c0            st.w            a0, fp, -4
  0x7fbf7546e5c4            st.d            a1, fp, -16
                        ;; size=24 bbWeight=1 PerfScore 16.00
G_M57823_IG02:        ; offs=0x000018, size=0x0024, bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, BB01 [0000], byref
  0x7fbf7546e5c8            ld.w            a0, fp, -4
  0x7fbf7546e5cc            bstrpick.d      a0, a0, 7, 0
  0x7fbf7546e5d0            ld.d            a1, fp, -16
                             ; gcrRegs +[a1]
recordRelocation: 0x7fbf7546e5d4 (rw: 0x7fbf7546e5d4) => 0x4203e8, type 18 (CorInfoReloc::LOONGARCH64_PC), delta 0
  0x7fbf7546e5d4            pcalau12i       a2, 0x0
  0x7fbf7546e5d8            addi.d          a2, a2, 0
                             ; gcrRegs +[a2]
recordRelocation: 0x7fbf7546e5dc (rw: 0x7fbf7546e5dc) => 0x43b780, type 19 (CorInfoReloc::LOONGARCH64_JIR), delta 0
  0x7fbf7546e5dc            pcaddu18i       t4, 0x0
  0x7fbf7546e5e0            jirl            ra, t4, #System.Diagnostics.Debug:Assert(bool,System.String,System.String)
                             ; gcrRegs -[a1-a2]
                             ; gcr arg pop 0
  0x7fbf7546e5e4            nop             
  0x7fbf7546e5e8            nop             
                        ;; size=36 bbWeight=1 PerfScore 27.50
G_M57823_IG03:        ; offs=0x00003C, size=0x0010, bbWeight=1, BB01 [0000], epilog, nogc, extend
  0x7fbf7546e5ec            ld.d            ra, sp, 24
  0x7fbf7546e5f0            ld.d            fp, sp, 16
  0x7fbf7546e5f4            addi.d          sp, sp, 32
  0x7fbf7546e5f8            jirl            zero, ra, 0x0
                        ;; size=16 bbWeight=1 PerfScore 11.50

Allocated method code size =   76 , actual size =   76, unused size =    0

; Total bytes of code 76, prolog size 24, PerfScore 55.00, instruction count 17, allocated bytes for code 76 (MethodHash=11ad1e20) for method System.Diagnostics.Debug:Assert(bool,System.String) (MinOpts)

...
...
...
*************** In gcInfoBlockHdrSave()
Set code length to 76.
Set stack base register to fp.
Set Outgoing stack arg area size to 0.
Stack slot id for offset -16 (-0x10) (frame) (untracked) = 0.
Register slot id for reg a1 = 1.
Register slot id for reg a2 = 2.
Set state of slot 1 at instr offset 0x24 to Live.
Set state of slot 2 at instr offset 0x28 to Live.       <------@@@@@@@@@@ error gc slot 
Set state of slot 1 at instr offset 0x34 to Dead.
Set state of slot 2 at instr offset 0x34 to Dead.
Defining interruptible range: [0x18, 0x40).

*************** Finishing PHASE Emit GC+EH tables
} Jitted Method 2145 at 00007fbf`7546e5b0 method System.Diagnostics.Debug:Assert(bool,System.String) size 0000004c
Method code size: 76

Fixed:

ILC - System.Diagnostics.Debug:Assert(bool,System.String)

G_M57823_IG01:        ; offs=0x000000, size=0x0018, bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, BB02 [0001], byref, prolog, nogc
  0x7fbf8152a298            addi.d          sp, sp, -32 
  0x7fbf8152a29c            st.d            fp, sp, 16
  0x7fbf8152a2a0            st.d            ra, sp, 24
  0x7fbf8152a2a4            addi.d          fp, sp, 16
  0x7fbf8152a2a8            st.w            a0, fp, -4
  0x7fbf8152a2ac            st.d            a1, fp, -16 
                        ;; size=24 bbWeight=1 PerfScore 16.00
G_M57823_IG02:        ; offs=0x000018, size=0x0024, bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, BB01 [0000], byref
  0x7fbf8152a2b0            ld.w            a0, fp, -4
  0x7fbf8152a2b4            bstrpick.d      a0, a0, 7, 0
  0x7fbf8152a2b8            ld.d            a1, fp, -16 
                             ; gcrRegs +[a1]
recordRelocation: 0x7fbf8152a2bc (rw: 0x7fbf8152a2bc) => 0x4203e8, type 18 (CorInfoReloc::LOONGARCH64_PC), delta 0 
  0x7fbf8152a2bc            pcalau12i       a2, 0x0
  0x7fbf8152a2c0            addi.d          a2, a2, 0
                             ; gcrRegs +[a2]
recordRelocation: 0x7fbf8152a2c4 (rw: 0x7fbf8152a2c4) => 0x43ce90, type 19 (CorInfoReloc::LOONGARCH64_JIR), delta 0 
  0x7fbf8152a2c4            pcaddu18i       t4, 0x0
  0x7fbf8152a2c8            jirl            ra, t4, #System.Diagnostics.Debug:Assert(bool,System.String,System.String)
                             ; gcrRegs -[a1-a2]
                             ; gcr arg pop 0
  0x7fbf8152a2cc            nop        
  0x7fbf8152a2d0            nop        
                        ;; size=36 bbWeight=1 PerfScore 27.50
G_M57823_IG03:        ; offs=0x00003C, size=0x0010, bbWeight=1, BB01 [0000], epilog, nogc, extend
  0x7fbf8152a2d4            ld.d            ra, sp, 24
  0x7fbf8152a2d8            ld.d            fp, sp, 16
  0x7fbf8152a2dc            addi.d          sp, sp, 32
  0x7fbf8152a2e0            jirl            zero, ra, 0x0 
                        ;; size=16 bbWeight=1 PerfScore 11.50


Allocated method code size =   76 , actual size =   76, unused size =    0

; Total bytes of code 76, prolog size 24, PerfScore 55.00, instruction count 17, allocated bytes for code 76 (MethodHash=11ad1e20) for method System.Diagnostics.Debug:Assert(bool,System.String) (MinOpts)
; ============================================================
...
...
...
*************** In gcInfoBlockHdrSave()
Set code length to 76.
Set stack base register to fp.
Set Outgoing stack arg area size to 0.
Stack slot id for offset -16 (-0x10) (frame) (untracked) = 0.
Register slot id for reg a1 = 1.
Register slot id for reg a2 = 2.
Set state of slot 1 at instr offset 0x24 to Live.
Set state of slot 2 at instr offset 0x2c to Live.   <---Fixed
Set state of slot 1 at instr offset 0x34 to Dead.
Set state of slot 2 at instr offset 0x34 to Dead.
Defining interruptible range: [0x18, 0x40).

*************** Finishing PHASE Emit GC+EH tables
} Jitted Method 2221 at 00007fbf`8152a298 method System.Diagnostics.Debug:Assert(bool,System.String) size 0000004c                                                                                                 
Method code size: 76

Release NativeAOT tests：
Time [secs] | Total | Passed | Failed | Skipped | ActiveIssue | Assembly Execution Summary
===========================================================================================
     11.494 |    21 |     21 |      0 |       0 |           0 | nativeaot.nativeaot
      0.000 |     0 |      0 |      0 |       0 |           0 | StandaloneRunnerTests
-------------------------------------------------------------------------------------------
     11.494 |    21 |     21 |      0 |       0 |           0 | (total)

Debug NativeAOT tests：
Time [secs] | Total | Passed | Failed | Skipped | ActiveIssue | Assembly Execution Summary
===========================================================================================
     34.288 |    21 |     21 |      0 |       0 |           0 | nativeaot.nativeaot
      0.000 |     0 |      0 |      0 |       0 |           0 | StandaloneRunnerTests
-------------------------------------------------------------------------------------------
     34.288 |    21 |     21 |      0 |       0 |           0 | (total)

LuckyXu-HF · 2026-08-31T10:02:57Z

@jakobbotsch could you please help to review this PR? Thanks.

[LoongArch64] Fix the GCReg update for the relocation case (pcalau12i…

f60ad67

… + addi.d/ld.d) of NativeAOT, the GCReg should update after calculation completed. * Fix the intermittent GC crash for NativeAOT test: `SmokeTests/DynamicGenerics`.

github-actions Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Aug 31, 2026

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shushanhf requested a review from jakobbotsch August 31, 2026 08:09

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LuckyXu-HF mentioned this pull request Aug 31, 2026

DynamicGenerics Access Violation on linux-musl-loongarch64 under emulation #131001

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build-analysis Bot mentioned this pull request Aug 31, 2026

[ci-scan] Test failure: COM Dynamic finalizer double-unadvises connection point #132947

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jakobbotsch merged commit 5163250 into dotnet:main Aug 31, 2026
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[main] Source code updates from dotnet/runtime dotnet/dotnet#8864

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[LoongArch64] Fix the GCReg update for the relocation case (pcalau12i + addi.d/ld.d) of NativeAOT, the GCReg should update after calculation completed. - #132963

[LoongArch64] Fix the GCReg update for the relocation case (pcalau12i + addi.d/ld.d) of NativeAOT, the GCReg should update after calculation completed.#132963
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