[ppc64le] Common.Tests and more tests are failing for missing opcode 'rcompare' on Power.

[vikasgupta8]

Description

The Common.Tests and more tests are failing in CI pipeline with below error.

Opcode 'rcompare' missing from machine description file.

Detail:

Console log: 'Common.Tests' from job eeb16027-4beb-4fd6-90c3-c27927786054 workitem 3bb2a0bd-4359-40c1-a4a4-5b0a495474d9 (ubuntu.2004.ppc64le.experimental.open) executed on machine dotnet-2 running Linux-5.4.0-146-generic-ppc64le-with-glibc2.29
+ ./RunTests.sh --runtime-path /home/helixbot/work/B37C091D/p
----- start Mon 03 Apr 2023 07:23:20 PM UTC =============== To repro directly: =====================================================
pushd .
/home/helixbot/work/B37C091D/p/dotnet exec --runtimeconfig Common.Tests.runtimeconfig.json --depsfile Common.Tests.deps.json xunit.console.dll Common.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================
~/work/B37C091D/w/AE690932/e ~/work/B37C091D/w/AE690932/e
Opcode 'rcompare' missing from machine description file.

=================================================================
	Native Crash Reporting
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

=================================================================
	Native stacktrace:
=================================================================
	0x7da4716ba2a8 - Unknown
	0x7da47166884c - Unknown
	0x7da4716b9768 - Unknown
	0x7da4721804c8 - Unknown
	0x7da471aed168 - Unknown
	0x7da471ac4850 - Unknown

Reproduction Steps

Run the runtime testcases.

Expected behavior

All the tests should pass without any failure or crash.

Actual behavior

Tests are failing with crash due to missing opcode 'rcompare'.

Regression?

No response

Known Workarounds

No response

Configuration

No response

[Sapana-Khemkar]

@vargaz We have noticed that these tests are failing after #82005 is merged.
I can see opcode rcompare is not implemented for power. I am trying to understand why your changes triggered. Can you please help me understanding this.