[PATCH] [ms-cxxabi] Raise aggregate memptr alignment to 8 for compatibility

[Reid Kleckner]

Hi majnemer,

With this change, we give different results for __alignof than MSVC, but
our record layout is compatible.

Some data member pointers also now have a size that is not a multiple of
their alignment.

Fixes PR18618.

http://llvm-reviews.chandlerc.com/D2669

Files:
  lib/AST/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-member-pointers.cpp
  test/Layout/ms-x86-member-pointers.cpp
  test/SemaCXX/member-pointer-ms.cpp
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