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

[Jay Foad via llvm-commits]

================
@@ -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)
----------------
jayfoad wrote:

This should still be `assert(!IsHazardRecognizerMode)` because the standalone hazard recognizer always runs top-down, right?

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