typedef struct _ir_phase ir_phase, *ir_phase_ptr;
typedef struct _ir_extblk ir_extblk, *ir_extblk_ptr;
typedef struct ir_exec_freq ir_exec_freq, *ir_exec_freq_ptr;
+typedef struct ir_cdep ir_cdep, *ir_cdep_ptr;
typedef struct sn_entry *seqno_t;
typedef void irg_walk_func(ir_node *, void *);