[CodeGen] Make OrigTy in CC lowering the non-aggregate type (#153414) https://github.com/llvm/llvm-project/pull/152709 exposed the original IR argument type to the CC lowering logic. However, in SDAG, this used the raw type, prior to aggregate splitting. This PR changes it to use the non-aggregate type instead. (This matches what happened in the GlobalISel case already.) I've also added some more detailed documentation on the InputArg/OutputArg fields, to explain how they differ. In most cases ArgVT is going to be the EVT of OrigTy, so they encode very similar information (OrigTy just preserves some additional information lost in EVTs, like pointer types). One case where they do differ is in post-legalization lowering of libcalls, where ArgVT is going to be a legalized type, while OrigTy is going to be the original non-legalized type.
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