[PATCH] Abstract out parts of thunk emission code, add support for simple thunks for -cxx-abi microsoft

[Timur Iskhodzhanov]

  Rebased the patch to use the new mangler class name; also, add one more test that used to crash before r191839.

Hi rnk,

http://llvm-reviews.chandlerc.com/D1787

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1787?vs=4573&id=4626#toc

Files:
  include/clang/Basic/ABI.h
  lib/AST/MicrosoftMangle.cpp
  lib/AST/VTableBuilder.cpp
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-thunks.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance.cpp
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