[clang] [AArch64] Change the coercion type of structs with pointer members. (PR #135064)

[Eli Friedman via cfe-commits]

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@@ -486,6 +486,39 @@ ABIArgInfo AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadicFn,
     }
     Size = llvm::alignTo(Size, Alignment);
 
+    // If the Aggregate is made up of pointers, use an array of pointers for the
+    // coerced type. This prevents having to convert ptr2int->int2ptr through
+    // the call, allowing alias analysis to produce better code.
+    std::function<bool(QualType Ty)> ContainsOnlyPointers = [&](QualType Ty) {
+      if (isEmptyRecord(getContext(), Ty, true))
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efriedma-quic wrote:

Are there any testcases covering the isEmptyRecord check?  (I think excluding empty records solves some potential weird issues, so it's probably a good idea, but I'd like to see some testing as well.)

https://github.com/llvm/llvm-project/pull/135064