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

[Charles Davis]

Hi nadav, asl, eugenis,

This change makes the variable argument intrinsics, `llvm.va_start` and
`llvm.va_copy`, and the `va_arg` instruction behave as they do on Windows
inside a `CallingConv::X86_64_Win64` function. It's needed for a Clang patch
I have to add support for GCC's `__builtin_ms_va_list` constructs.

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

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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