[llvm] AMDGPU: Refactor mfma hazard handling [NFC] (PR #84276)

[Stanislav Mekhanoshin via llvm-commits]

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

This is a very nice factoring. I tried my best to factor this out from the hazard table which eventually ended up in a tie to pass number. Thought the table was updated so many times that I have overlooked this dependency. Thanks Matt!

https://github.com/llvm/llvm-project/pull/84276