* A liveness interval border.
*/
typedef struct _border_t {
- unsigned magic; /**< A magic number for checking. */
+ DEBUG_ONLY(unsigned magic;) /**< A magic number for checking. */
struct list_head list; /**< list head for queuing. */
struct _border_t *other_end; /**< The other end of the border. */
ir_node *irn; /**< The node. */