rjmccall added a comment. This seems backwards. Clang knows what the actual ABI alignment of the C type is, and it doesn't have to match the alignment of the IR type that IRGen produces. It's the actual C ABI alignment that's supposed to affect the calling convention, so there needs to be some way to specify the C ABI alignment on the parameter in IR. That may mean using `byval`, which can be given an explicit alignment.
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