[llvm] [AMDGPU][NewPM] Port SIShrinkInstructions to new pass manager. (PR #106967)

[Christudasan Devadasan via llvm-commits]

================
@@ -1077,3 +1081,21 @@ bool SIShrinkInstructions::runOnMachineFunction(MachineFunction &MF) {
   }
   return false;
 }
+
+bool SIShrinkInstructionsLegacy::runOnMachineFunction(MachineFunction &MF) {
+  if (skipFunction(MF.getFunction()))
+    return false;
+
+  return SIShrinkInstructions().run(MF);
+}
+
+PreservedAnalyses
+SIShrinkInstructionsPass::run(MachineFunction &MF,
+                              MachineFunctionAnalysisManager &) {
+  if (MF.getFunction().hasOptNone() || !SIShrinkInstructions().run(MF))
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cdevadas wrote:

This early exit is mainly to skip the optimization passes for -O0. This specific check hasOptNone checks for the function attribute Attribute::OptimizeNone, set to true for -O0 opt.levels. The attributes and metadata are still in the LLVM IR and not available in the MIR. 

https://github.com/llvm/llvm-project/pull/106967