[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));
+  if (!II)
+    return nullptr;
+
+  // Isolate the ptrauth bundle from the others.
+  std::optional<OperandBundleUse> PtrAuthBundleOrNone;
+  SmallVector<OperandBundleDef, 2> NewBundles;
+  for (unsigned BI = 0, BE = Call.getNumOperandBundles(); BI != BE; ++BI) {
+    OperandBundleUse Bundle = Call.getOperandBundleAt(BI);
+    if (Bundle.getTagID() == LLVMContext::OB_ptrauth)
+      PtrAuthBundleOrNone = Bundle;
+    else
+      NewBundles.emplace_back(Bundle);
+  }
+
----------------
kovdan01 wrote:

I'd probably add smth like this here to return early:

```
  if (!PtrAuthBundleOrNone)
    return nullptr;
```

With this, you can delete corresponding checks below.

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