[llvm] AMDGPU/NewPM Port GCNDPPCombine to NPM (PR #105816)

[Christudasan Devadasan via llvm-commits]

================
@@ -749,9 +752,17 @@ bool GCNDPPCombine::combineDPPMov(MachineInstr &MovMI) const {
   return !Rollback;
 }
 
-bool GCNDPPCombine::runOnMachineFunction(MachineFunction &MF) {
+bool GCNDPPCombineLegacy::runOnMachineFunction(MachineFunction &MF) {
+  if (skipFunction(MF.getFunction())) {
+    return false;
+  }
+  GCNDPPCombine Impl;
+  return Impl.run(MF);
----------------
cdevadas wrote:

```suggestion
  return  GCNDPPCombine().run(MF);
```

https://github.com/llvm/llvm-project/pull/105816