[llvm] [AArch64][PAC] Lower direct authenticated calls to ptrauth constants. (PR #97664)

[Daniil Kovalev via llvm-commits]

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@@ -9374,6 +9374,14 @@ void SelectionDAGBuilder::LowerCallSiteWithPtrAuthBundle(
   assert(Discriminator->getType()->isIntegerTy(64) &&
          "Invalid ptrauth discriminator");
 
+  // Look through ptrauth constants to find the raw callee.
+  // Do a direct unauthenticated call if we found it and everything matches.
+  if (auto *CalleeCPA = dyn_cast<ConstantPtrAuth>(CalleeV))
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kovdan01 wrote:

```suggestion
  if (const auto *CalleeCPA = dyn_cast<ConstantPtrAuth>(CalleeV))
```

https://github.com/llvm/llvm-project/pull/97664