[llvm] [InstCombine] Combine ptrauth constants into ptrauth intrinsics. (PR #94705)

[Daniil Kovalev via llvm-commits]

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@@ -2643,13 +2643,14 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
     // (sign|resign) + (auth|resign) can be folded by omitting the middle
     // sign+auth component if the key and discriminator match.
     bool NeedSign = II->getIntrinsicID() == Intrinsic::ptrauth_resign;
+    Value *Ptr = II->getArgOperand(0);
     Value *Key = II->getArgOperand(1);
     Value *Disc = II->getArgOperand(2);
 
     // AuthKey will be the key we need to end up authenticating against in
     // whatever we replace this sequence with.
     Value *AuthKey = nullptr, *AuthDisc = nullptr, *BasePtr;
-    if (auto CI = dyn_cast<CallBase>(II->getArgOperand(0))) {
+    if (auto *CI = dyn_cast<CallBase>(Ptr)) {
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kovdan01 wrote:

nit
```suggestion
    if (const auto *CI = dyn_cast<CallBase>(Ptr)) {
```

https://github.com/llvm/llvm-project/pull/94705