[PATCH] MS ABI: Fix vftable mangling by using the vbtable name algorithm

[Reid Kleckner]

Hi timurrrr, majnemer,

This merges VFPtrInfo and VBTableInfo into VPtrInfo, since they hold
almost the same information.  With that change, the vbtable mangling
code can easily be applied to vftable data and we magically get the
correct, unambiguous vftable names.

Fixes PR17748.

http://llvm-reviews.chandlerc.com/D2893

Files:
  include/clang/AST/VTableBuilder.h
  lib/AST/VTableBuilder.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-vtables-single-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance.cpp
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