PR middle-end/20991
	* cgraph.h (cgraph_local_info): Add vtable_method field.
	* varasm.c (mark_decl_referenced): If cgraph_global_info_ready
	and node is vtable_method, finalized and not reachable, don't do
	anything.

	* class.c: Include cgraph.h.
	(cp_fold_obj_type_ref): Set node->local.vtable_method.
	* Make-lang.in (cgraph.o): Depend on $(CGRAPH_H).

	* g++.dg/opt/pr20991.C: New test.

From-SVN: r98674