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

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs -misched-cluster=0 < %s | FileCheck -check-prefix=GCN %s
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arsenm wrote:

It's brutally expensive. Unless you are adding a test for a case that hits a verifier error, it's probably not worth it. We've traditionally blindly added it to every test. The expensive checks bits will get it eventually if it does fail the verifier 

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