9210 remove KMDB branch debugging support
9211 ::crregs could do with cr2/cr3 support
9209 ::ttrace should be able to filter by thread
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>

*** 21,31 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  /*
!  * Copyright (c) 2012, Joyent, Inc.  All rights reserved.
   */
  
  #ifndef _MDB_TARGET_IMPL_H
  #define _MDB_TARGET_IMPL_H
  
--- 21,31 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  /*
!  * Copyright (c) 2018, Joyent, Inc.  All rights reserved.
   */
  
  #ifndef _MDB_TARGET_IMPL_H
  #define _MDB_TARGET_IMPL_H
  
*** 102,112 ****
  
          int (*t_status)(mdb_tgt_t *, mdb_tgt_status_t *);
          int (*t_run)(mdb_tgt_t *, int, const struct mdb_arg *);
          int (*t_step)(mdb_tgt_t *, mdb_tgt_status_t *);
          int (*t_step_out)(mdb_tgt_t *, uintptr_t *);
-         int (*t_step_branch)(mdb_tgt_t *);
          int (*t_next)(mdb_tgt_t *, uintptr_t *);
          int (*t_cont)(mdb_tgt_t *, mdb_tgt_status_t *);
          int (*t_signal)(mdb_tgt_t *, int);
  
          int (*t_add_vbrkpt)(mdb_tgt_t *, uintptr_t,
--- 102,111 ----