[PATCH] [ms-cxxabi] Implement member pointer conversions

[Reid Kleckner]

    - Fix null handling for reinterpret casts.
    - Implement Richard's feedback

Hi rjmccall,

http://llvm-reviews.chandlerc.com/D741

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D741?vs=1828&id=1901#toc

Files:
  lib/CodeGen/CGCXXABI.cpp
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-member-pointers.cpp
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