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

[Anton Korobeynikov]

  Ideally you should custom lower the necessary libcalls. See e.g. in ARM backend how this is handled for SDIVREM nodes (ARMTargetLowering::LowerDivRem and around).

http://reviews.llvm.org/D1998