[PATCH] MS ABI: Use musttail for vtable thunks that pass arguments by value

[Reid Kleckner]

Hi majnemer,

This moves some memptr specific code into the generic thunk emission
codepath.

Fixes PR20053.

http://reviews.llvm.org/D4613

Files:
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-nontrivial-covariant-thunk.cpp
  test/CodeGenCXX/microsoft-abi-virtual-member-pointers.cpp
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