[PATCH] MS ABI: Pass 'sret' as the second parameter of instance methods

[Reid Kleckner]

Hi rsmith, majnemer,

MSVC always passes 'sret' after 'this', unlike GCC.  This required
changing a number of places in Clang that assumed the sret parameter was
always first in LLVM IR.

This fixes win64 MSVC ABI compatibility for methods returning structs.

http://reviews.llvm.org/D3618

Files:
  include/clang/CodeGen/CGFunctionInfo.h
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  lib/CodeGen/TargetInfo.cpp
  test/CodeGenCXX/microsoft-abi-cdecl-method-sret.cpp
  test/CodeGenCXX/microsoft-abi-sret-and-byval.cpp
  test/CodeGenCXX/microsoft-abi-virtual-member-pointers.cpp
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