[clang] [compiler-rt] [llvm] [PGO][AMDGPU] Add offload profiling with uniformity-aware optimization (PR #177665)

[Yaxun Liu via llvm-commits]

yxsamliu wrote:

Updated to use library calls (`__gpu_pgo_is_sampled`, `__gpu_pgo_increment` in `InstrProfilingGPU.c`) for the GPU instrumentation instead of inline IR, building on Joseph's profile library infrastructure.

https://github.com/llvm/llvm-project/pull/177665