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

[Reid Kleckner]

Closed by commit rL214004 (authored by @rnk).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D4613

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