mature_immBlock (get_irg_current_block(irg));
add_immBlock_pred (get_irg_end_block(irg), x);
mature_immBlock (get_irg_end_block(irg));
mature_immBlock (get_irg_current_block(irg));
add_immBlock_pred (get_irg_end_block(irg), x);
mature_immBlock (get_irg_end_block(irg));