beabi requires out edges

ir/be/beabi.c

@@ -2144,6 +2144,8 @@ void be_abi_introduce(ir_graph *irg)
 	env->init_sp = dummy;
 	env->calls   = NEW_ARR_F(ir_node*, 0);
 
+	edges_assure(irg);
+
 	if (options->pic) {
 		irg_walk_graph(irg, fix_pic_symconsts, NULL, env);
 	}