[PATCH] [ms-cxxabi] Correctly compute the size of member pointers

[Reid Kleckner]

    - Update the test case to pass under x86_64.
    - Implement John's comments.
    - commit attr tablegen changes, add implicit model attr.
    - Don't add attributes when we can figure out what the inheritance model is from the record definition.
    - Split funciton member pointer case from data case.
    - add the unspecified attr to redecls.

Hi rjmccall,

http://llvm-reviews.chandlerc.com/D568

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D568?vs=1416&id=1433#toc

Files:
  lib/AST/ASTContext.cpp
  lib/AST/CXXABI.h
  lib/AST/ItaniumCXXABI.cpp
  lib/AST/MicrosoftCXXABI.cpp
  lib/Sema/SemaType.cpp
  test/SemaCXX/member-pointer-ms.cpp
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