[llvm] [AMDGPU] Rewrite GFX12 SGPR hazard handling to dedicated pass (PR #118750)

[Carl Ritson via llvm-commits]

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@@ -1670,6 +1672,8 @@ void GCNPassConfig::addPreEmitPass() {
   // cases.
   addPass(&PostRAHazardRecognizerID);
 
+  addPass(&AMDGPUWaitSGPRHazardsLegacyID);
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perlfu wrote:

In theory InsertDelayAlu can adjust `s_delay_alu` settings based on presence of `s_wait_alu` instructions, but I don't think support for this tracking yet exists.
Pass position was to place it after PostRAHazardRecognizer from where functionality was moved.

https://github.com/llvm/llvm-project/pull/118750