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JIT: Illegal instruction at JitTest_chain_boxunbox_il.Test.Main() under DOTNET_JitStressRegs=0x2000 #112163

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Description

@saucecontrol

Description

Seen in two separate PRs on the runtime-coreclr jitstress-isas-avx512 pipeline.

https://dev.azure.com/dnceng-public/public/_build/results?buildId=939955 for #111778

and

https://dev.azure.com/dnceng-public/public/_build/results?buildId=939970 for #111853

Reproduction Steps

View logs for the above CI runs

22:36:26.039 Running test: JIT/Methodical/Boxing/boxunbox/chain_d/chain_d.dll
Fatal error. System.ExecutionEngineException: Illegal instruction: Attempted to execute an instruction code not defined by the processor.
   at JitTest_chain_boxunbox_il.Test.Main()
   at Program.<<Main>$>g__TestExecutor80|0_81(System.IO.StreamWriter, System.IO.StreamWriter, <>c__DisplayClass0_0 ByRef)
   at Program.<Main>$(System.String[])
22:45:42.226 Running test: JIT/Methodical/Boxing/boxunbox/chain_r/chain_r.dll
Fatal error. System.ExecutionEngineException: Illegal instruction: Attempted to execute an instruction code not defined by the processor.
   at JitTest_chain_boxunbox_il.Test.Main()
   at Program.<<Main>$>g__TestExecutor80|0_81(System.IO.StreamWriter, System.IO.StreamWriter, <>c__DisplayClass0_0 ByRef)
   at Program.<Main>$(System.String[])

Expected behavior

No failures

Actual behavior

Illegal Instruction crash

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    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIin-prThere is an active PR which will close this issue when it is merged

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