[llvm] [AMDGPU] Refine GCNHazardRecognizer hasHazard() (PR #138841)

[Jay Foad via llvm-commits]

================
@@ -441,42 +441,106 @@ using IsExpiredFn = function_ref<bool(const MachineInstr &, int WaitStates)>;
 using GetNumWaitStatesFn = function_ref<unsigned int(const MachineInstr &)>;
 
 // Search for a hazard in a block and its predecessors.
-template <typename StateT>
+template <typename StateT, typename StateTraitsT>
----------------
jayfoad wrote:

In this implementation I don't see the need for a separate traits class. getHashValue and isEqual can just be static methods in the state class.

https://github.com/llvm/llvm-project/pull/138841