[llvm] [AMDGPU] Detect VALU-after-MFMA hazard in post-RA scheduler's getHazardType (PR #184084)

[Anshil Gandhi via llvm-commits]

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gandhi56 wrote:

I moved the check for a VALU immediately after an MFMA in GCNPostGenericScheduler, which I introduce in this revision. At the time of scheduling a VALU, the scheduler will bump a cycle if the VALU was inserted immediately after an MFMA.

https://github.com/llvm/llvm-project/pull/184084