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>

*** 24,34 ****
   * Use is subject to license terms.
   */
  
  /*
   * Copyright (c) 2012 by Delphix. All rights reserved.
!  * Copyright (c) 2015 Joyent, Inc. All rights reserved.
   * Copyright (c) 2013 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   * Copyright (c) 2015, 2017 by Delphix. All rights reserved.
   */
  
  #include <sys/elf.h>
--- 24,34 ----
   * Use is subject to license terms.
   */
  
  /*
   * Copyright (c) 2012 by Delphix. All rights reserved.
!  * Copyright (c) 2018 Joyent, Inc. All rights reserved.
   * Copyright (c) 2013 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   * Copyright (c) 2015, 2017 by Delphix. All rights reserved.
   */
  
  #include <sys/elf.h>
*** 2741,2755 ****
                  if (strcmp(argv->a_un.a_str, "out") == 0) {
                          func = &mdb_tgt_step_out;
                          name = "step (out)";
                          argv++;
                          argc--;
-                 } else if (strcmp(argv->a_un.a_str, "branch") == 0) {
-                         func = &mdb_tgt_step_branch;
-                         name = "step (branch)";
-                         argv++;
-                         argc--;
                  } else if (strcmp(argv->a_un.a_str, "over") == 0) {
                          func = &mdb_tgt_next;
                          name = "step (over)";
                          argv++;
                          argc--;
--- 2741,2750 ----