[PATCH] Do not assert when dereferencing member pointer using virtual inheritance with an incomplete class type

[David Majnemer]

Hi rnk, rsmith,

The MS ABI requires that we determine the vbptr offset if have a virtual inheritance model.  Instead, raise an error pointing to the diagnostic when this happens.

This fixes PR18583.

http://llvm-reviews.chandlerc.com/D2842

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