[llvm] AMDGPU/GlobalISel: RegBankLegalize rules for DS barrier arrive atomics (PR #192767)

[via llvm-commits]

vangthao95 wrote:

Created https://github.com/llvm/llvm-project/pull/192765 to mark `ds_atomic_barrier_arrive_rtn_b64` as divergence. I will remove the uniform rule and rebase after that is merged.

https://github.com/llvm/llvm-project/pull/192767