[clang] [compiler-rt] [llvm] [PGO][AMDGPU] Add uniformity-aware offload profile format and instrumentation (PR #190708)

[Larry Meadows via cfe-commits]

lfmeadow wrote:

@yxsamliu It seems solid. Is there any use-facing doc? An end-to-end HIP test would be nice. But LGTM

https://github.com/llvm/llvm-project/pull/190708