Remove the declaration of the deleted function firm_default_hash().

include/libfirm/irnode.h

@@ -839,13 +839,6 @@ FIRM_API void set_irn_dbg_info(ir_node *n, dbg_info *db);
  */
 FIRM_API dbg_info *get_irn_dbg_info(const ir_node *n);
 
-/**
- * Calculate a hash value of a node. Only inputs, mode and opcode are used.
- *
- * @param node  the node to hash
- */
-FIRM_API unsigned firm_default_hash(const ir_node *node);
-
 /**
  * Returns a descriptive name of a node (containing type+number)
  */