[PATCH] Delay lookup of simple default template arguments under -fms-compatibility

[Reid Kleckner]

Hi rsmith,

MSVC delays parsing of default arguments until instantiation.  If the
default argument is never used, it is never parsed.  We don't model
this.

Instead, if lookup of a type name fails in a template argument context,
we form a DependentNameType, which will be looked up at instantiation
time.

This fixes errors about 'CControlWinTraits' in atlwin.h.

http://reviews.llvm.org/D3995

Files:
  include/clang/AST/Type.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Parse/Parser.h
  include/clang/Sema/Sema.h
  lib/AST/ASTContext.cpp
  lib/Parse/ParseDecl.cpp
  lib/Sema/SemaDecl.cpp
  test/SemaTemplate/ms-delayed-default-template-args.cpp
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