[llvm] [InstCombine] Combine ptrauth intrin. callee into same-key bundle. (PR #94707)

[Daniil Kovalev via llvm-commits]

================
@@ -3665,6 +3665,78 @@ static IntrinsicInst *findInitTrampoline(Value *Callee) {
   return nullptr;
 }
 
+Instruction *InstCombinerImpl::foldPtrAuthIntrinsicCallee(CallBase &Call) {
+  Value *Callee = Call.getCalledOperand();
+  auto *IPC = dyn_cast<IntToPtrInst>(Callee);
+  if (!IPC || !IPC->isNoopCast(DL))
+    return nullptr;
+
+  IntrinsicInst *II = dyn_cast<IntrinsicInst>(IPC->getOperand(0));
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kovdan01 wrote:

nit
```suggestion
  const IntrinsicInst *II = dyn_cast<IntrinsicInst>(IPC->getOperand(0));
```

https://github.com/llvm/llvm-project/pull/94707