remove more unused loop fields

ir/ana/irloop_t.h

@@ -49,11 +49,6 @@ struct ir_loop {
 	unsigned        depth;            /**< Nesting depth */
 	struct ir_loop *outer_loop;       /**< The outer loop */
 	loop_element   *children;         /**< Mixed flexible array: Contains sons and loop_nodes */
-	ir_tarval      *loop_iter_start;  /**< counting loop: the start value */
-	ir_tarval      *loop_iter_end;    /**< counting loop: the last value reached */
-	ir_tarval      *loop_iter_increment; /**< counting loop: the increment */
-	ir_node        *loop_iter_variable;  /**< The iteration variable of counting loop.*/
-
 	void *link;                       /**< link field. */
 #ifdef DEBUG_libfirm
 	long loop_nr;                     /**< A unique node number for each loop node to make output