[PATCH] Abstract out the emission of vtables, add basic support for vtable emission when using -cxx-abi microsoft

[Timur Iskhodzhanov]

  Addressed Reid's comments

Hi rnk, rjmccall,

http://llvm-reviews.chandlerc.com/D1532

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1532?vs=3896&id=3971#toc

Files:
  test/CodeGenCXX/microsoft-abi-structors.cpp
  test/CodeGenCXX/microsoft-abi-vtables-multiple-nonvirtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-single-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-constexpr-vs-inheritance.cpp
  test/CodeGenCXX/virtual-base-destructor-call.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-multiple-nonvirtual-inheritance.cpp
  include/clang/AST/VTableBuilder.h
  include/clang/AST/Mangle.h
  lib/AST/VTableBuilder.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/AST/ItaniumMangle.cpp
  lib/CodeGen/CGVTables.h
  lib/CodeGen/CGVTT.cpp
  lib/CodeGen/CGExprConstant.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/CGCXX.cpp
  lib/CodeGen/CodeGenModule.h
  lib/CodeGen/CGDebugInfo.cpp
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/MicrosoftCXXABI.cpp
  lib/CodeGen/ItaniumCXXABI.cpp
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