[AMDGPU] Extend MFMA padding option to gfx90a+ (#86768)

It was shown experimentally that this may have some benefit on newer HW.

Author: kerbowa

llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp

@@ -2357,6 +2357,9 @@ int GCNHazardRecognizer::checkMAIHazards90A(MachineInstr *MI) {
       break;
   }
 
+  // Pad neighboring MFMA with noops for better inter-wave performance.
+  WaitStatesNeeded = std::max(WaitStatesNeeded, checkMFMAPadding(MI));
+
   return WaitStatesNeeded;
 }