* @param growth_factor A factor denoting how many node slots will be additionally allocated,
* if the node => data is full. 256 means 1.0.
* @param irn_data_init A callback that is called to initialize newly created node data.
* @param priv Some private pointer which is kept in the phase and can be retrieved with phase_get_private().
* @return A new phase object.
*/
* @param growth_factor A factor denoting how many node slots will be additionally allocated,
* if the node => data is full. 256 means 1.0.
* @param irn_data_init A callback that is called to initialize newly created node data.
* @param priv Some private pointer which is kept in the phase and can be retrieved with phase_get_private().
* @return A new phase object.
*/