-/** Replaces one type by the other.
- *
- * Old type is replaced by new_type. All references to old_type
- * now point to new_type. The memory for the old type is destroyed,
- * but still used. Therefore it is not freed.
- * All referenced to this memory will be lost after a certain while.
- * An exception is the list of types in irp (irprog.h).
- * In the future there might be a routine to recover the memory, but
- * this will be at considerable runtime cost.
- *
- * @param old_type - The old type that shall be replaced by the new type.
- * @param new_type - The new type that will replace old_type.
- *
- */
-void exchange_types(ir_type *old_type, ir_type *new_type);
-
-/** Skip id types until a useful type is reached.
- *
- * @param tp - A type of arbitrary kind.
- *
- * @return
- * tp if it is not an id type.
- * If tp is an id type returns the real type it stands for.
- */
-ir_type *skip_tid(ir_type *tp);
-