PR c++/13950, DR 176

	PR c++/13950, DR 176
	* search.c (lookup_field_r): Allow lookup to find the
	injected-class-name from a template base.
	(template_self_reference_p): Remove.
	* decl.c (make_typename_type): Diagnose ambiguity.  Use
	maybe_get_template_decl_from_type_decl.
	* parser.c (cp_parser_template_name): Pass true to is_template
	rather than use maybe_get_template_decl_from_type_decl.
	(cp_parser_lookup_name): Use maybe_get_template_decl_from_type_decl.
	* pt.c (maybe_get_template_decl_from_type_decl): Handle ambiguity.
	Use DECL_SELF_REFERENCE_P.

	* parser.c (cp_parser_parse_and_diagnose_invalid_type_name):
	Avoid duplicate ambiguity error.
	* error.c (dump_decl): Don't say "typedef" for injected-class-name.
	* pt.c (convert_template_argument): Tweak logic.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@154223 138bc75d-0d04-0410-961f-82ee72b054a4