[llvm] [AArch64][PAC] Lower ptrauth constants in code for MachO. (PR #97665)

[Daniil Kovalev via llvm-commits]

================
@@ -848,20 +848,39 @@ void AArch64AsmPrinter::emitHwasanMemaccessSymbols(Module &M) {
   }
 }
 
-template <typename MachineModuleInfoTarget>
-static void emitAuthenticatedPointer(
-    MCStreamer &OutStreamer, MCSymbol *StubLabel,
-    const typename MachineModuleInfoTarget::AuthStubInfo &StubInfo) {
+static void emitAuthenticatedPointer(MCStreamer &OutStreamer,
+                                     MCSymbol *StubLabel,
+                                     const MCExpr *StubAuthPtrRef) {
   // sym$auth_ptr$key$disc:
   OutStreamer.emitLabel(StubLabel);
-  OutStreamer.emitValue(StubInfo.AuthPtrRef, /*size=*/8);
+  OutStreamer.emitValue(StubAuthPtrRef, /*size=*/8);
 }
 
 void AArch64AsmPrinter::emitEndOfAsmFile(Module &M) {
   emitHwasanMemaccessSymbols(M);
 
   const Triple &TT = TM.getTargetTriple();
   if (TT.isOSBinFormatMachO()) {
+
+    // Output authenticated pointers as indirect symbols, if we have any.
+    MachineModuleInfoMachO &MMIMacho =
+        MMI->getObjFileInfo<MachineModuleInfoMachO>();
+
+    auto Stubs = MMIMacho.getAuthGVStubList();
+
+    if (!Stubs.empty()) {
+      // Switch to the "__auth_ptr" section.
+      OutStreamer->switchSection(
+          OutContext.getMachOSection("__DATA", "__auth_ptr", MachO::S_REGULAR,
+                                     SectionKind::getMetadata()));
+      emitAlignment(Align(8));
+
+      for (auto &Stub : Stubs)
----------------
kovdan01 wrote:

```suggestion
      for (const auto &Stub : Stubs)
```

https://github.com/llvm/llvm-project/pull/97665