[llvm] [NewPM] Add `FunctionToMachineFunctionPassAdaptor` (PR #88711)

[Arthur Eubanks via llvm-commits]

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@@ -100,13 +125,50 @@ ModuleToMachineFunctionPassAdaptor::run(Module &M, ModuleAnalysisManager &AM) {
   return PA;
 }
 
+PreservedAnalyses
+FunctionToMachineFunctionPassAdaptor::run(Function &F,
+                                          FunctionAnalysisManager &FAM) {
+  // Do not codegen any 'available_externally' functions at all, they have
+  // definitions outside the translation unit.
+  if (F.isDeclaration() || F.hasAvailableExternallyLinkage())
+    return PreservedAnalyses::all();
+
+  auto &MF = FAM.getResult<MachineFunctionAnalysis>(F).getMF();
+  auto &MFAM = FAM.getResult<MachineFunctionAnalysisManagerFunctionProxy>(F)
+                   .getManager();
+  auto PI = FAM.getResult<PassInstrumentationAnalysis>(F);
+  PreservedAnalyses PA = PreservedAnalyses::all();
+
+  if (!PI.runBeforePass<MachineFunction>(*Pass, MF))
+    return PreservedAnalyses::all();
+  PreservedAnalyses PassPA = Pass->run(MF, MFAM);
+  MFAM.invalidate(MF, PassPA);
+  if (Pass->name() != FreeMachineFunctionPass::name()) {
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aeubanks wrote:

oh I see you mentioned that in the commit descriptiong

https://github.com/llvm/llvm-project/pull/88711