+ * Returns an array (an ARR_F) of the programs blocks in reverse postorder
+ * (note: caller has to free the memory with DEL_ARR_F after use;
+ * of course you can use ARR_LEN on the array too.)
+ */
+ir_node **be_get_cfgpostorder(ir_graph *irg);
+
+/**
+ * convenience function to return the first successor block
+ * (it is often known that there is exactly 1 successor anyway)