Ppc64le bug fixes

[alhad-deshpande]

This PR fixes below 2 github issues:

1. Stack unwinding segmentation fault occurring in System.Runtime.Tests, fixed 74069
2. Conditional branching g_assert occurring in PCR2 tests74057

Fixes #74069
Fixes #74057

[alhad-deshpande]

@vargaz @akoeplinger
This PR is intended for RC1 release. Hence request to you please merge it in RC1 branch as well.

[akoeplinger]

/azp run runtime-community

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[akoeplinger]

@alhad-deshpande as far as I know it's too late for RC1 but I can backport it to RC2 (@vargaz is on vacation).

[alhad-deshpande]

@akoeplinger
Yes, please backport it to RC2.

[akoeplinger]

@alhad-deshpande there are some test failures for PPC64 in https://dev.azure.com/dnceng/public/_build/results?buildId=1973269&view=logs&j=13a47023-c67b-5350-920c-f75d7d69650d&t=54de2c5f-c9e1-522b-3533-a199af7b864d, could you please take a look and check they're not related?

[Sapana-Khemkar]

@akoeplinger
Link which you have shared, build started at 2pm.
If I go through link https://dev.azure.com/dnceng/public/_build/results?buildId=1973496&view=logs&j=13a47023-c67b-5350-920c-f75d7d69650d&t=54de2c5f-c9e1-522b-3533-a199af7b864d. It is result after @alhad-deshpande has raised PR.
And as per logs on this link both issues mentioned in PR has been fixed.
Can you please check logs again?

[akoeplinger]

@Sapana-Khemkar yeah I retried the job and now it just fails in System.Runtime.Serialization.Formatters.Tests which I assume is a different issue. Are you planning on looking at that soon too, i.e. should we wait with the backport until that one is fixed too?

[janani66]

@akoeplinger The timeout seen in System.Runtime.Serialization.Formatters.Tests is different and we don't see it on our machines. So not sure if that is a resource issue on the machines you'll have. Nutshell -- please merge these changes as it fixes the main issues we were working on

[akoeplinger]

/backport to release/7.0

[github-actions]

Started backporting to release/7.0: https://github.com/dotnet/runtime/actions/runs/2950215241

[github-actions]

@akoeplinger backporting to release/7.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch

Applying: Avoid transformation from multiplication to left shift in case of 64 bit value
Using index info to reconstruct a base tree...
M	src/coreclr/pal/src/misc/perfjitdump.cpp
M	src/mono/mono/mini/local-propagation.c
Falling back to patching base and 3-way merge...
Auto-merging src/mono/mono/mini/local-propagation.c
No changes -- Patch already applied.
Applying: Fixed System.Collections.Concurrent.Tests timeout issue
Using index info to reconstruct a base tree...
M	src/mono/mono/mini/cpu-ppc.mdesc
M	src/mono/mono/mini/cpu-ppc64.mdesc
M	src/mono/mono/mini/mini-ppc.c
Falling back to patching base and 3-way merge...
Auto-merging src/mono/mono/mini/mini-ppc.c
CONFLICT (content): Merge conflict in src/mono/mono/mini/mini-ppc.c
Auto-merging src/mono/mono/mini/cpu-ppc64.mdesc
CONFLICT (content): Merge conflict in src/mono/mono/mini/cpu-ppc64.mdesc
Auto-merging src/mono/mono/mini/cpu-ppc.mdesc
CONFLICT (content): Merge conflict in src/mono/mono/mini/cpu-ppc.mdesc
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 Fixed System.Collections.Concurrent.Tests timeout issue
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[janani66]

Ok , will port it manually