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

[Changpeng Fang via llvm-commits]

changpeng wrote:

I removed -verify-machineinstrs since it is not directly related what we plan to check in this test.

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