[PATCH] [ms-cxxabi] Implement MSVC virtual base adjustment

[Reid Kleckner]

Hi rjmccall,

While we can't yet emit vbtables, this allows us to find virtual bases
of objects constructed in other TUs.

This make iostream hello world work, since basic_ostream virtually
inherits from basic_ios.

http://llvm-reviews.chandlerc.com/D795

Files:
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/virtual-base-cast.cpp
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