[PATCH] Abstract out virtual calls and virtual function prologue code generation

[Timur Iskhodzhanov]

  Addressed the comments. Includes running clang-format on most changes.

Hi rjmccall, rnk,

http://llvm-reviews.chandlerc.com/D1260

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1260?vs=3129&id=3143#toc

Files:
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGCXX.cpp
  lib/CodeGen/CodeGenModule.h
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGCXXABI.cpp
  lib/CodeGen/CGExprCXX.cpp
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/CGVTables.h
  lib/AST/VTableBuilder.cpp
  test/CodeGenCXX/microsoft-abi-vtables-single-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
  include/clang/AST/VTableBuilder.h
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