[llvm] [AMDGPU] Add a debug option `-amdgpu-snop-padding` for `GCNHazardRecognizer` (PR #146587)

[Matt Arsenault via llvm-commits]

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@@ -300,7 +305,8 @@ unsigned GCNHazardRecognizer::PreEmitNoops(MachineInstr *MI) {
   unsigned W = PreEmitNoopsCommon(MI);
   fixHazards(MI);
   CurrCycleInstr = nullptr;
-  return W;
+  unsigned NopPad = NopPadding.getNumOccurrences() ? NopPadding : 0;
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arsenm wrote:

Can just use the raw value? Don't see why you need to check getNumOccurrences 

https://github.com/llvm/llvm-project/pull/146587