Fix nested non-byref like VC with no pointer fields

[AaronRobinsonMSFT]

Tests need to be added. This is just for checking existing tests on all platforms first.

Fixes#80624

[AaronRobinsonMSFT]

@BrzVlad@vargaz@lambdageek Any thoughts on the llvmfullaot legs?

[vargaz]

The failure is in the newly added tests, so it definitely looks like a mono problem. I'd suggest disabling it for now for mono.

[AaronRobinsonMSFT]

@mangod9 Can you suggest someone who could help review this change? @davidwrighton is away.

[mangod9]

@trylek, who can take a look.

[trylek]

LGTM, thanks for fixing this!

[AaronRobinsonMSFT]

/backport to release/7.0

[github-actions]

Started backporting to release/7.0: https://github.com/dotnet/runtime/actions/runs/3961567258

[github-actions]

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

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch
Applying: Fix nested non-byref like VC with no pointer fields
Applying: Add tests
Applying: Fix test typo
Applying: Disable new test on llvmaot
Using index info to reconstruct a base tree...
M	src/tests/issues.targets
Falling back to patching base and 3-way merge...
Auto-merging src/tests/issues.targets
CONFLICT (content): Merge conflict in src/tests/issues.targets
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0004 Disable new test on llvmaot
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!

[github-actions]

@AaronRobinsonMSFT an error occurred while backporting to release/7.0, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.