12310 Add demangle(1) command

*** 9,19 ****
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
   * Copyright 2017 Jason King
!  * Copyright 2018, Joyent, Inc.
   */
  
  #ifndef _DEMANGLE_SYS_H
  #define _DEMANGLE_SYS_H
  
--- 9,19 ----
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
   * Copyright 2017 Jason King
!  * Copyright 2019 Joyent, Inc.
   */
  
  #ifndef _DEMANGLE_SYS_H
  #define _DEMANGLE_SYS_H
  
*** 32,41 ****
--- 32,42 ----
  typedef struct sysdem_alloc_s {
          void *(*alloc)(size_t);
          void (*free)(void *, size_t);
  } sysdem_ops_t;
  
+ boolean_t sysdem_parse_lang(const char *, sysdem_lang_t *);
  char *sysdemangle(const char *, sysdem_lang_t, sysdem_ops_t *);
  
  #ifdef __cplusplus
  }
  #endif