sgraenitz added a comment. The symptom is that Clang emits `movq %rax, %rdi` instead of `movq %rax, %rcx` while `objc_retainAutoreleasedReturnValue()` still expects the value in `%rcx`. It appears related to D94597 <https://reviews.llvm.org/D94597>. Is this a calling convention issue?
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