[clang] [PAC] Implement authentication for C++ member function pointers (PR #99576)

[Daniil Kovalev via cfe-commits]

================
@@ -365,6 +365,40 @@ llvm::Constant 
*CodeGenModule::getFunctionPointer(GlobalDecl GD,
   return getFunctionPointer(getRawFunctionPointer(GD, Ty), FuncType);
 }
 
+CGPointerAuthInfo CodeGenModule::getMemberFunctionPointerAuthInfo(QualType FT) 
{
+  assert(FT->getAs<MemberPointerType>() && "MemberPointerType expected");
+  auto &Schema = getCodeGenOpts().PointerAuth.CXXMemberFunctionPointers;
----------------
kovdan01 wrote:

Nit

```suggestion
  const auto &Schema = getCodeGenOpts().PointerAuth.CXXMemberFunctionPointers;
```

https://github.com/llvm/llvm-project/pull/99576
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