[clang] [llvm] [LLVMABI][AARCH64] Handle conditions for ignoring empty types (PR #224476)

[Peter Smith via llvm-commits]

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@@ -794,4 +794,78 @@ TEST_F(AArch64TargetInfoTest, ClassifyArgumentOveralignedHFAAlign) {
   }
 }
 
+// Empty records and zero-size types are ignored as returns under all AArch64
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smithp35 wrote:

I agree that that matching existing clang behaviour is the right thing to do.

It looks like the difference is optimization level. Just add -O1 or -O2 to your example. It looks odd, something I'll need to check with the GCC team.

https://github.com/llvm/llvm-project/pull/224476