[llvm] [ArgPromotion] Perform alias analysis on actual arguments of Calls (PR #106216)

[Matthew Devereau via llvm-commits]

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@@ -485,11 +485,39 @@ static bool allCallersPassValidPointerForArgument(
   });
 }
 
+// Try to prove that all Calls to F do not modify the memory pointed to by Arg,
+// using alias analysis local to each caller of F.
+static bool isArgUnmodifiedByAllCalls(Function *F, unsigned ArgNo,
+                                      FunctionAnalysisManager &FAM) {
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MDevereau wrote:

Can we pass just in an `Argument*` here and use `Argument->getParent()` and `Argument->getArgNo()` to simplify the function signature?

https://github.com/llvm/llvm-project/pull/106216