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44252f4d35
* sret logic needed a check for hasRuntimeBits()
* lower f128 on windows targets with the "sse" class rather than
"memory". For reference, clang emits a compile error when __float128
is used with the MSVC ABI, saying that this type is not supported.
The docs for the x64 calling convention have both of these sentences:
- "Any argument that doesn't fit in 8 bytes, or isn't 1, 2, 4, or 8 bytes,
must be passed by reference."
- "All floating point operations are done using the 16 XMM registers."
* For i128, however, it is clear that the Windows calling convention
wants such an object to be passed by reference. I fixed the LLVM
lowering for function parameters to make this work.