[PATCH] Fix PR18967 -- Bad this adjustment for virtual methods in a diamond virtual inheritance hierarchy

[Timur Iskhodzhanov]

Hi rnk,

Also refactor/simplify code a little bit, as well as fix a few bugs in the return adjustment handling

http://llvm-reviews.chandlerc.com/D2985

Files:
  lib/AST/VTableBuilder.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-multiple-nonvirtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-return-thunks.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance-pr18967.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance-vtordisps.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance.cpp
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