[llvm] AMDGPU: Treat SWMMAC the same as MFMA and other WMMA for sched_barrier (PR #85721)

[Stanislav Mekhanoshin via llvm-commits]

https://github.com/rampitec approved this pull request.

LGTM beyond the discussion about the test.

https://github.com/llvm/llvm-project/pull/85721