[compiler-rt] [msan] Support prctl PR_GET_NAME call (PR #98951)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka requested changes to this pull request.

Thanks for the patch!

It's needs a few small improvements.

Please don't forget to click "re-request review" after updating.

https://github.com/llvm/llvm-project/pull/98951