* @param self The isa object.
* @param irgs A flexible array ARR_F of length 0 where the backend can append the desired irgs.
* @return A flexible array ARR_F containing all desired irgs in the desired order.
* @param self The isa object.
* @param irgs A flexible array ARR_F of length 0 where the backend can append the desired irgs.
* @return A flexible array ARR_F containing all desired irgs in the desired order.