[llvm] [OpenMP] Replace AMDGPU fences with generic scoped fences (PR #119619)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

I ran this through some local testing and did not see any issues with it. No other concerns from my side either. Waiting for another bit and others to jump in.

https://github.com/llvm/llvm-project/pull/119619