[PATCH] Support __builtin_ms_va_list.

[Charles Davis]

  * Nuke `__builtin_ms_va_arg`. GCC doesn't have it; they use the normal `__builtin_va_arg` instead. (Yes, this is horrifying.)
  * Add tests for serialization and templates.

Hi rsmith, rnk, rjmccall,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1623?vs=4119&id=4153#toc

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/Expr.h
  include/clang/Basic/BuiltinsX86.def
  include/clang/Basic/TargetInfo.h
  include/clang/Sema/Sema.h
  include/clang/Serialization/ASTBitCodes.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTDiagnostic.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/Sema/Sema.cpp
  lib/Sema/SemaChecking.cpp
  lib/Sema/SemaExpr.cpp
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriter.cpp
  lib/Serialization/ASTWriterStmt.cpp
  test/CodeGen/ms_abi.c
  test/PCH/Inputs/va_arg.h
  test/PCH/va_arg.c
  test/PCH/va_arg.cpp
  test/PCH/va_arg.h
  test/Sema/varargs-x86-64.c
  test/SemaTemplate/instantiate-expr-3.cpp
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