[PATCH] Make variable argument intrinsics behave correctly in a Win64 CC function.

[Charles Davis]

  Create a no-op varargs handler in msan for a Win64 ABI function.

Hi nadav, asl, eugenis, resistor,

http://llvm-reviews.chandlerc.com/D1622

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1622?vs=4118&id=4152#toc

Files:
  include/llvm/CodeGen/SelectionDAG.h
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  test/CodeGen/X86/x86-64-ms_abi-vararg.ll
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