[llvm] [NewPM][X86] Port X86ExpandPseudo to NPM (PR #173463)

[via llvm-commits]

================
@@ -941,6 +956,26 @@ bool X86ExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
 }
 
 /// Returns an instance of the pseudo instruction expansion pass.
-FunctionPass *llvm::createX86ExpandPseudoPass() {
-  return new X86ExpandPseudo();
+FunctionPass *llvm::createX86ExpandPseudoLegacyPass() {
+  return new X86ExpandPseudoLegacy();
+}
+
+bool X86ExpandPseudoLegacy::runOnMachineFunction(MachineFunction &MF) {
+  X86ExpandPseudoImpl Impl;
+  return Impl.runOnMachineFunction(MF);
+}
+
+PreservedAnalyses
+X86ExpandPseudoPass::run(MachineFunction &MF,
+                         MachineFunctionAnalysisManager &MFAM) {
+  X86ExpandPseudoImpl Impl;
+  bool Changed = Impl.runOnMachineFunction(MF);
+  if (!Changed)
+    return PreservedAnalyses::all();
+
+  PreservedAnalyses PA = PreservedAnalyses::none();
----------------
paperchalice wrote:

```suggestion
  PreservedAnalyses PA = getMachineFunctionPassPreservedAnalyses();
```

https://github.com/llvm/llvm-project/pull/173463