[PATCH] Support __builtin_ms_va_list.

[Charles Davis]

Hi rsmith, rnk, rjmccall,

This change adds support for `__builtin_ms_va_list`, a GCC extension for
variadic `ms_abi` functions. The existing `__builtin_va_list` support is
inadequate for this because `va_list` is defined differently in the Win64
ABI vs. the System V/AMD64 ABI.

Depends on D1622.

http://llvm-reviews.chandlerc.com/D1623

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/Expr.h
  include/clang/Basic/BuiltinsX86.def
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/TargetInfo.h
  include/clang/Basic/TokenKinds.def
  include/clang/Sema/Sema.h
  include/clang/Serialization/ASTBitCodes.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTDiagnostic.cpp
  lib/AST/StmtPrinter.cpp
  lib/Basic/TargetInfo.cpp
  lib/Basic/Targets.cpp
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGExprAgg.cpp
  lib/CodeGen/CGExprComplex.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/TargetInfo.cpp
  lib/Parse/ParseExpr.cpp
  lib/Parse/ParseTentative.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaChecking.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/TreeTransform.h
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriter.cpp
  lib/Serialization/ASTWriterStmt.cpp
  test/CodeGen/ms_abi.c
  test/Sema/varargs-x86-64.c
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