* @param cls The register class.
* @param dom_front Dominance frontier information.
* @param irn The node to insert the Perm after.
* @return The Perm or NULL if nothing was live before @p irn.
*/
ir_node *insert_Perm_after(const arch_env_t *arch_env,
* @param cls The register class.
* @param dom_front Dominance frontier information.
* @param irn The node to insert the Perm after.
* @return The Perm or NULL if nothing was live before @p irn.
*/
ir_node *insert_Perm_after(const arch_env_t *arch_env,