[llvm] [ArgPromotion] Handle pointer arguments of recursive calls (PR #78735)

[Nikita Popov via llvm-commits]

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@@ -611,6 +639,33 @@ static bool findArgParts(Argument *Arg, const DataLayout &DL, AAResults &AAR,
       // unknown users
     }
 
+    auto *CB = dyn_cast<CallBase>(V);
+    Value *PtrArg = cast<Value>(U);
+    if (CB && PtrArg && CB->getCalledFunction() == CB->getFunction()) {
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nikic wrote:

This should probably also check that the function type of the call and function match? I wouldn't want to reason about how the arguments map if this is not the case.

https://github.com/llvm/llvm-project/pull/78735