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Assertion failed 'compIsaSupportedDebugOnly(InstructionSet_SSE2)' #37260

@BruceForstall

Description

@BruceForstall

Over 52,000 tests in the runtime-coreclr jitstress-isas-x86 pipeline failed (presumably all) with:

      Assert failure(PID 7268 [0x00001c64], Thread: 5492 [0x1574]): Assertion failed 'compIsaSupportedDebugOnly(InstructionSet_SSE2)' in 'VectorRelopTest`1[Single][System.Single]:VectorRelOp(float,float):int' during 'Importation' (IL size 1406)
      
          File: F:\workspace\_work\1\s\src\coreclr\src\jit\simdashwintrinsic.cpp Line: 870
          Image: C:\h\w\9D4B08E8\p\CoreRun.exe

Pipeline results:
https://dev.azure.com/dnceng/public/_build/results?buildId=665306&view=ms.vss-test-web.build-test-results-tab

Example:
https://helix.dot.net/api/2019-06-17/jobs/a36943e0-4275-4b16-9f01-6d656c33e5eb/workitems/JIT/console

    JIT\SIMD\VectorRelOp_r\VectorRelOp_r.cmd [FAIL]
      
      Assert failure(PID 7268 [0x00001c64], Thread: 5492 [0x1574]): Assertion failed 'compIsaSupportedDebugOnly(InstructionSet_SSE2)' in 'VectorRelopTest`1[Single][System.Single]:VectorRelOp(float,float):int' during 'Importation' (IL size 1406)
      
          File: F:\workspace\_work\1\s\src\coreclr\src\jit\simdashwintrinsic.cpp Line: 870
          Image: C:\h\w\9D4B08E8\p\CoreRun.exe
      
      
      Return code:      1
      Raw output file:      C:\h\w\9D4B08E8\w\A49A0919\e\JIT\SIMD\Reports\JIT.SIMD\VectorRelOp_r\VectorRelOp_r.output.txt
      Raw output:
      BEGIN EXECUTION
       "C:\h\w\9D4B08E8\p\corerun.exe" VectorRelOp_r.dll 
      Expected: 100
      Actual: -1073740286
      END EXECUTION - FAILED
      FAILED
      Test Harness Exitcode is : 1
      To run the test:
      > set CORE_ROOT=C:\h\w\9D4B08E8\p
      > C:\h\w\9D4B08E8\w\A49A0919\e\JIT\SIMD\VectorRelOp_r\VectorRelOp_r.cmd
      Expected: True
      Actual:   False
      Stack Trace:
        F:\workspace\_work\1\s\artifacts\tests\coreclr\Windows_NT.x86.Checked\TestWrappers\JIT.SIMD\JIT.SIMD.XUnitWrapper.cs(9646,0): at JIT_SIMD._VectorRelOp_r_VectorRelOp_r_._VectorRelOp_r_VectorRelOp_r_cmd()
      Output:

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area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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