[llvm] [AMDGPU] Support bottom-up postRA scheduing. (PR #135295)

[Harrison Hao via llvm-commits]

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@@ -417,7 +417,9 @@ void GCNHazardRecognizer::AdvanceCycle() {
 }
 
 void GCNHazardRecognizer::RecedeCycle() {
-  llvm_unreachable("hazard recognizer does not support bottom-up scheduling.");
+  if (IsHazardRecognizerMode || ST.getGeneration() < AMDGPUSubtarget::GFX11)
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harrisonGPU wrote:

Yes, hazard recognizer always runs top-down, I have updated it, what do you think about it?

https://github.com/llvm/llvm-project/pull/135295