Fix unaligned string hash access - #954
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This fixes a UBSAN error in string hashing.
The hash code was reading string data as
uint64_tblocks, but the string data isn't always 8-byte aligned. This happens with Ladybug's inline short strings and causes UBSAN to abort.I changed the 8-byte load to use
memcpyinto a localuint64_tinstead.Also added a regression test that hashes the same bytes from aligned and intentionally misaligned memory and checks that the result is the same.
Part of #879.