runtime: Test failure in CI: Assertion failed in System.Tests.ValueTupleTests:LongTuplesWithNull()

See https://ci.dot.net/job/dotnet_coreclr/job/master/job/jitstress/job/x64_arm64_altjit_checked_windows_nt_corefx_baseline_prtest/25/consoleFull#62222254079fe3b83-f408-404c-b9e7-9207d232e5fc from https://github.com/dotnet/coreclr/pull/16223

17:51:12   Discovered:  System.ValueTuple.Tests
17:51:13   Starting:    System.ValueTuple.Tests
17:51:19   
17:51:19 
  Assert failure(PID 9188 [0x000023e4], Thread: 3328 [0x0d00]): Assertion failed 'varDsc->lvOnFrame && !varDsc->lvRegister' in 'System.Tests.ValueTupleTests:LongTuplesWithNull()' (IL size 741)
17:51:19   
17:51:19       File: d:\j\workspace\x64_arm64_alt---e876825d\src\jit\codegenarmarch.cpp Line: 753
17:51:19       Image: D:\j\workspace\x64_arm64_alt---e876825d\_\fx\bin\testhost\netcoreapp-Windows_NT-Release-x64\dotnet.exe
17:51:19   
17:51:19   Finished running tests.  End time=17:51:18.86, Exit code = 123456789
17:51:19 D:\j\workspace\x64_arm64_alt---e876825d\_\fx\Tools\tests.targets(492,5): warning MSB3073: The command "D:\j\workspace\x64_arm64_alt---e876825d\_\fx\bin/tests/System.ValueTuple.Tests/netcoreapp-Windows_NT-Release-x64//RunTests.cmd D:\j\workspace\x64_arm64_alt---e876825d\_\fx\bin/testhost/netcoreapp-Windows_NT-Release-x64/" exited with code 123456789. [D:\j\workspace\x64_arm64_alt---e876825d\_\fx\src\System.ValueTuple\tests\System.ValueTuple.Tests.csproj]

cc @stephentoub, @jcouv, @tarekgh