[llvm] [CodeGen] Add OffloadBlockUniformityAnalysis for offload PGO (PR #178417)

[Yaxun Liu via llvm-commits]

yxsamliu wrote:

Thanks. @jdoerfert, do you remember the issue or have a link to it? I can check whether it applies to this PR.

https://github.com/llvm/llvm-project/pull/178417