[PATCH] [ms-cxxabi] Add a new calling convention that swaps 'this' and 'sret'

[Reid Kleckner]

Hi rafael.espindola,

MSVC always places the 'this' parameter for a method first.  The
implicit 'sret' pointer for methods always comes second.  We already
implement this for __thiscall by putting sret parameters on the stack,
but __cdecl methods require putting both parameters on the stack in
opposite order.

Using a special calling convention allows frontends to keep the sret
parameter first, which avoids breaking lots of assumptions in LLVM and
Clang.

Fixes PR15768 with the corresponding change in Clang.

http://llvm-reviews.chandlerc.com/D2663

Files:
  include/llvm/IR/CallingConv.h
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLToken.h
  lib/IR/AsmWriter.cpp
  lib/Target/X86/X86CallingConv.h
  lib/Target/X86/X86CallingConv.td
  test/CodeGen/X86/cdecl-method-return.ll
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