[PATCH] Initialize vtorDisp in class constructors and destructors

[Timur Iskhodzhanov]

Hi rnk,

This is not a full vtorDisp support (e.g. vtorDisp thunks are still TODO), but an important step forward.

If vtorDisp is not initialized (as is as of ToT), executing a vtorDisp thunk (e.g. emitted by CL) is very likely to cause segfault, even on a completely-constructed object. With this patch, we can at least correctly handle completely-constructed objects.

Other pieces of the puzzle will follow.

http://llvm-reviews.chandlerc.com/D1867

Files:
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
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