[PATCH] MS ABI: Properly call global delete when invoking virtual destructors

[David Majnemer]

Hi rnk,

The Itanium ABI approach of using offset-to-top isn't possible with the
MS ABI, it doesn't have that kind of information lying around.

Instead, we do the following:
- Call the virtual deleting destructor with the "don't delete the object
  flag" set.  The virtual deleting destructor will return a pointer to
  'this' adjusted to the most derived class.
- Call the global delete using the adjusted 'this' pointer.

http://reviews.llvm.org/D5996

Files:
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGExprCXX.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/dllexport.cpp
  test/CodeGenCXX/microsoft-abi-structors.cpp
  test/CodeGenCXX/microsoft-abi-thunks.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
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