[PATCH] 128-bit ABI for x86_64-w64-mingw32 incorrectly generated

[Jameson Nash]

Bug #16168

Summary: The calling convention of 128-bit integers generated for Windows x86-64 appears to be incorrectly using an approximation of the Linux ABI instead of the Windows ABI.

The llvm math intrinsics need to be updated to use call-by-reference for i128 parameters, and need to expect the return value in the XMM0 register, to be compatible with GCC and Microsoft on the Win64 platform.

http://llvm-reviews.chandlerc.com/D1998

Files:
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
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