runtime: System.Numerics.Vectors.Tests: Assertion failed 'intrinsicId == NI_Vector128_GetElement'

The System.Numerics.Vectors.Tests are failing in our rolling build, on:

• net7.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open
• net7.0-Linux-Release-x64-CoreCLR_checked-(Alpine.314.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr<span />.microsoft.com/dotnet-buildtools/prereqs:alpine-3.14-helix-amd64-20210910135833-1848e19
• net7.0-windows-Release-x86-CoreCLR_checked-Windows.10.Amd64.Open
• net7.0-windows-Release-x64-CoreCLR_checked-Windows.10.Amd64.Open

build, log

Starting:    System.Numerics.Vectors.Tests (parallel test collections = on, max threads = 2)

Assert failure(PID 9962 [0x000026ea], Thread: 9979 [0x26fb]): Assertion failed 'intrinsicId == NI_Vector128_GetElement' in '<>c__DisplayClass159_0`1[UInt64][System.UInt64]:<TestIndexerOutOfRange>b__0():this' during 'Generate code' (IL size 18)

    File: /__w/1/s/src/coreclr/jit/hwintrinsiccodegenxarch.cpp Line: 1285
    Image: /datadisks/disk1/work/AF440984/p/dotnet

It appears the failure was introduced within this range of commits: https://github.com/dotnet/runtime/compare/dbd4cbb40253f58d825e33f301a422837990871e...d936a661c56f742b1660279aacb9a47d4ba1bd30 (see the builds before and after). @AndyAyersMS would you be able to take a look?

Runfo Tracking Issue: system.numerics.vectors.tests work item

Build	Definition	Kind	Run Name	Console	Core Dump	Test Results	Run Client
1599103	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open	console.log	core dump		runclient.py
1599103	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-(Alpine.314.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.14-helix-amd64-20210910135833-1848e19	console.log	core dump		runclient.py
1599103	runtime	Rolling	net7.0-windows-Release-x86-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1599103	runtime	Rolling	net7.0-windows-Release-x64-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1598707	runtime	PR 64861	net7.0-windows-Release-x86-CoreCLR_release-Windows.10.Amd64.Server19H1.ES.Open	console.log	core dump		runclient.py
1598707	runtime	PR 64861	net7.0-windows-Release-x86-CoreCLR_release-Windows.7.Amd64.Open	console.log	core dump		runclient.py
1598566	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-(Alpine.314.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.14-helix-amd64-20210910135833-1848e19	console.log	core dump		runclient.py
1598566	runtime	Rolling	net7.0-windows-Release-x86-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1598566	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open	console.log	core dump		runclient.py
1598566	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open	console.log	core dump		runclient.py
1598566	runtime	Rolling	net7.0-windows-Release-x64-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1597732	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-Ubuntu.1804.Amd64.Open	console.log	core dump		runclient.py
1597732	runtime	Rolling	net7.0-Linux-Release-x64-CoreCLR_checked-(Alpine.314.Amd64.Open)Ubuntu.1804.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.14-helix-amd64-20210910135833-1848e19	console.log	core dump		runclient.py
1597732	runtime	Rolling	net7.0-windows-Release-x64-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1597732	runtime	Rolling	net7.0-windows-Release-x86-CoreCLR_checked-Windows.10.Amd64.Open	console.log	core dump		runclient.py
1596919	runtime	PR 64851	net7.0-OSX-Debug-x64-Mono_release-OSX.1200.Amd64.Open	console.log
1596919	runtime	PR 64851	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log
1596919	runtime	PR 64851	net7.0-OSX-Debug-x64-CoreCLR_release-OSX.1200.Amd64.Open	console.log
1596889	runtime	PR 63958	net7.0-OSX-Debug-x64-Mono_release-OSX.1200.Amd64.Open	console.log
1596889	runtime	PR 63958	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log
1596889	runtime	PR 63958	net7.0-OSX-Debug-x64-CoreCLR_release-OSX.1200.Amd64.Open	console.log
1596826	runtime	PR 64567	net7.0-OSX-Debug-x64-Mono_release-OSX.1200.Amd64.Open	console.log
1596826	runtime	PR 64567	net7.0-OSX-Debug-x64-CoreCLR_release-OSX.1200.Amd64.Open	console.log
1596826	runtime	PR 64567	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log
1596805	runtime	PR 64330	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log
1596805	runtime	PR 64330	net7.0-OSX-Debug-x64-CoreCLR_release-OSX.1200.Amd64.Open	console.log
1596805	runtime	PR 64330	net7.0-OSX-Debug-x64-Mono_release-OSX.1200.Amd64.Open	console.log
1596759	runtime	PR 64806	net7.0-OSX-Debug-x64-Mono_release-OSX.1200.Amd64.Open	console.log
1596759	runtime	PR 64806	net7.0-OSX-Debug-x64-CoreCLR_release-OSX.1200.Amd64.Open	console.log
1596759	runtime	PR 64806	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log
1596708	runtime	PR 64748	net7.0-OSX-Debug-x64-CoreCLR_checked-OSX.1200.Amd64.Open	console.log

Build Result Summary

Day Hit Count	Week Hit Count	Month Hit Count
4	10	10