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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>

@@ -24,11 +24,11 @@
  * Use is subject to license terms.
  */
 
 /*
  * Copyright (c) 2012 by Delphix. All rights reserved.
- * Copyright (c) 2015 Joyent, Inc. 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>

@@ -2741,15 +2741,10 @@
                 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--;