struct obstack *obst = be_get_birg_obst(irg);
backend_info_t *old_info = be_get_info(old_node);
backend_info_t *new_info = be_get_info(new_node);
struct obstack *obst = be_get_birg_obst(irg);
backend_info_t *old_info = be_get_info(old_node);
backend_info_t *new_info = be_get_info(new_node);