[llvm] [AMDGPU][NFC] Prepare the MFMA hazard checks for per-producer windows (PR #225988)

[Michael Halkenhäuser via llvm-commits]

mhalk wrote:

> #218363 Actually it has not been merged yet, but I'd expect that one to be merged first.

Ah! Yes, I'd expect that too and had the same PR in mind.
But I wanted to make sure I'm not missing any other work in that area.

https://github.com/llvm/llvm-project/pull/225988