[llvm] [AMDGPU] Enable overwrite ALU bit in sched.barrier mask (PR #160782)

[via llvm-commits]

hidekisaito wrote:

LGTM. This is a compatibility breaking (in perf sense) change.  Please plan to clarify in https://llvm.org/docs/AMDGPUUsage.html, saying interpretation has changed.

https://github.com/llvm/llvm-project/pull/160782