re PR c++/19497 (Invalid declaration in template diagnosed too late)

re PR c++/19497 (Invalid declaration in template diagnosed too late)

cp:
	PR c++/19497
	* cp-tree.def (USING_DECL): Update documentation.
	* cp-tree.h (DECL_DEPENDENT_P): New.
	(USING_DECL_DECLS, USING_DECL_SCOPE): New.
	* class.c (handle_using_decl): Move most of the processing to ...
	* name-lookup.c (do_class_using_decl): ... here.  Make stricter.
	(push_using_decl): Use USING_DECL_SCOPE.
	(cp_emit_debug_info_for_using): Make extern.
	* cxx-pretty-print.c (pp_cxx_statement) <USING_DECL case>: Adjust.
	* name-lookup.h (cp_emit_debug_info_for_using): Declare.
	* pt.c (tsubst_decl) <USING_DECL case>: Use do_class_using_decl
	when tsubsting.
	(tsubst_expr): Use USING_DECL_SCOPE.
	* search.c (lookup_field_1): Use DECL_DEPENDENT_P.
	* semantics.c (finish_member_declaration): Likewise.
testsuite:
	PR c++/19497
	* g++.dg/inherit/using5.C: New.
	* g++.dg/inherit/using6.C: New.

From-SVN: r100757