[maleadt]

Before Julia 1.12, codegen itself looks up callees in our cache. If Julia discarded a callee's inferred source (for example, a non-inlineable @nospecialize helper with a non-compileable signature), jl_compile_workqueue re-inferred it with the native interpreter, bypassing our method tables. This PR keeps inferred sources on those versions by setting may_discard_trees to false before 1.12.0-DEV.1823. Later versions already recover discarded sources with our interpreter.

As a result, Julia 1.10 now compiles @nospecialize calls without a dynamic jl_invoke, as 1.11 and later already do. The test that expected a dynamic invoke on 1.10 now checks the same behavior on all versions.

Split from #940. Before Julia 1.12, the Julia IR passes added there (#948) don't see callees re-inferred by the native interpreter. Without this PR, such callees stay dynamic calls on 1.10, as on main, so the stack doesn't depend on it.

GPUCompiler's native tests pass on Julia 1.10 and 1.11. The full suite passes on 1.10 and 1.11 together with the #940 stack.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.39%. Comparing base (70ad652) to head (81d46eb).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #947      +/-   ##
==========================================
+ Coverage   86.32%   86.39%   +0.06%     
==========================================
  Files          29       29              
  Lines        5756     5756              
==========================================
+ Hits         4969     4973       +4     
+ Misses        787      783       -4     

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