* cgraph.h: Remove misledaing comment on ipa-ref.h.
	(symtab_type): New enum.
	(symtab_node): New structure.
	(cgraph_node, varpool_node): Add symbol base type.
	(cgraph, varpool): New accestor functions.
	* cgraph.c (cgraph_create_node_1): Set symbol type.
	* varpool.c (varpool_node): Set symbol type.

From-SVN: r186284