b2fae5b3c7
Replace Mips custom logic for retaining information about original types in calling convention lowering by directly querying the OrigTy that is now available. There is one change in behavior here: If the return type is a struct containing fp128 plus additional members, the result is now different, as we no longer special case to a single fp128 member. I believe this is fine, because this is a fake ABI anyway: Such cases should actually use sret, and as such are a frontend responsibility, and Clang will indeed emit these as sret, not as a return value struct. So this only impacts manually written IR tests.
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