* cp-tree.h (lang_type): Remove has_assignment and
	has_real_assignment.  Add befriending_classes.
	(TYPE_HAS_ASSIGNMENT): Remove.
	(TYPE_HAS_REAL_ASSIGNMENT): Likewise.
	(CLASSTYPE_BEFRIENDING_CLASSES): New macro.
	(lang_decl): Document.
	(DECL_BEFRIENDING_CLASSES): New macro.
	(FRIEND_NAME): Move declaration to more obvious location.
	(FRIEND_DECLS): Likewise.
	* class.c (finish_struct_1): Don't use TYPE_HAS_REAL_ASSIGNMENT.
	* decl.c (duplicate_decls): Copy DECL_BEFRIENDING_CLASSES.
	(fixup_anonymous_union): Don't use TYPE_HAS_ASSIGNMENT.
	(grok_op_properties): Likewise.
	* friend.c (is_friend): Use FRIEND_NAME and FRIEND_DECLS.
	(add_friend): Likewise.  Don't do weird things with assignment
	operators.  Update DECL_BEFRIENDING_CLASSES.
	(add_friends): Don't do weird things with assignment operators.
	(make_friend_class): Likewise.  Update
	CLASSTYPE_BEFRIENDING_CLASSES.
	* pt.c (instantiate_class_template): Don't set
	TYPE_HAS_ASSIGNMENT.
	(tsubst_copy): Substitute the TREE_TYPE for more unary
	expressions.
	* ptree.c (print_lang_type): Don't look at TYPE_HAS_ASSIGNMENT.
	* search.c (protected_accessible_p): New function.
	(friend_accessible_p): Likewise.
	(accessible_p): Use them.

From-SVN: r25940