* error.c (dump_simple_decl): Use DECL_CLASS_SCOPE_P and/or
	DECL_NAMESPACE_SCOPE_P.
	(lang_decl_name): Likewise.
	* pt.c (tsubst_friend_function, tsubst): Likewise.
	* decl.c (pushdecl, redeclaration_error_message, start_decl,
	cp_finish_decl, start_function): Likewise.
	* class.c (finish_struct_1): Likewise.
	* call.c (build_over_call): Likewise.
	(compare_ics): Use DERIVED_FROM_P.

From-SVN: r19705