[PATCH] Add explicit Win64 and System V calling conventions to the x86_64 backend

[Charles Davis]

Hi asl, nadav,

This patch adds explicit calling convention types for the Win64 and System V/x86-64 ABIs. This allows code to override the default, and use the Win64 convention on a target that wants to use SysV (and vice-versa). This is needed to implement the `ms_abi` and `sysv_abi` GNU attributes.

http://llvm-reviews.chandlerc.com/D729

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.td
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/win64_params.ll
  test/CodeGen/X86/win_chkstk.ll
  utils/vim/llvm.vim
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