Lots of GCStress failures in HWIntrinsics tests

[BruceForstall]

E.g., https://ci.dot.net/job/dotnet_coreclr/job/master/job/jitstress/job/x64_checked_windows_nt_gcstress0xc/78/#showFailuresLink

JIT_HardwareIntrinsics._X86_Avx_Avx_r_Avx_r_._X86_Avx_Avx_r_Avx_r_cmd
JIT_HardwareIntrinsics._X86_Avx_Avx_ro_Avx_ro_._X86_Avx_Avx_ro_Avx_ro_cmd
JIT_HardwareIntrinsics._X86_Sse41_Sse41_r_Sse41_r_._X86_Sse41_Sse41_r_Sse41_r_cmd
JIT_HardwareIntrinsics._X86_Sse41_MultipleSumAbsoluteDifferences_r_MultipleSumAbsoluteDifferences_r_._X86_Sse41_MultipleSumAbsoluteDifferences_r_MultipleSumAbsoluteDifferences_r_cmd
JIT_HardwareIntrinsics._X86_Avx2_Avx2_ro_Avx2_ro_._X86_Avx2_Avx2_ro_Avx2_ro_cmd
JIT_HardwareIntrinsics._X86_Avx2_Avx2_r_Avx2_r_._X86_Avx2_Avx2_r_Avx2_r_cmd
JIT_HardwareIntrinsics._X86_Sse41_ConvertToVector128_r_ConvertToVector128_r_._X86_Sse41_ConvertToVector128_r_ConvertToVector128_r_cmd
JIT_HardwareIntrinsics._X86_Ssse3_Ssse3_r_Ssse3_r_._X86_Ssse3_Ssse3_r_Ssse3_r_cmd
JIT_HardwareIntrinsics._X86_Sse3_Sse3_r_Sse3_r_._X86_Sse3_Sse3_r_Sse3_r_cmd
JIT_HardwareIntrinsics._X86_Sse_Sse_r_Sse_r_._X86_Sse_Sse_r_Sse_r_cmd

[BruceForstall]

@CarolEidt @fiigii @tannergooding
cc @dotnet/jit-contrib

[fiigii]

I have investigated this issue for https://github.com/dotnet/coreclr/issues/16370. The codegen of HW intrinsics looks no problem... May need help from GC experts @jkotas

[sdmaclea]

@BruceForstall Are they in x86 and arm64 tests? I can take a look at arm64 failures if needed.

[BruceForstall]

You can see all the various stress (GC and JIT) jobs here: https://ci.dot.net/job/dotnet_coreclr/job/master/job/jitstress/

@BruceForstall Are they in x86 and arm64 tests? I can take a look at arm64 failures if needed.

Looks like x86 has similar failures: https://ci.dot.net/job/dotnet_coreclr/job/master/job/jitstress/job/x86_checked_windows_nt_gcstress0xc/72/#showFailuresLink

Our Windows arm64 runs have been broken for a while due to machine issues. In the next week or so, the next run will hopefully be valid. It looks like we don't run GCStress on non-Windows arm64 machines (well, it looks like there are jobs defined, but never run. Probably without triggers or cron definitions.)

[tannergooding]

Fix should be here: dotnet/coreclr#16957