* cp-tree.h (CPTR_AGGR_TAG): New global tree node.

	* cp-tree.h (CPTR_AGGR_TAG): New global tree node.
	(current_aggr): Define.
	* decl.c (grokdeclarator): Make sure a friend class is an
	elaborated type specifier.
	* parse.y (current_aggr): Remove static definition.
	(cp_parse_init): Adjust.
	(structsp): Clear and restore current_aggr.
	(component_decl_list): Clear current_aggr.

	* error.c (dump_type, case TYPENAME_TYPE): Don't emit the
	aggregate tag on the typename's context.

	* pt.c (tsubst_friend_class): Return NULL, if parms becomes NULL.
	(instantiate_class_template): Ignore NULL friend types.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35755 138bc75d-0d04-0410-961f-82ee72b054a4