7085 add support for "if" and "else" statements in dtrace

*** 24,34 ****
   * Use is subject to license terms.
   */
  
  /*
   * Copyright (c) 2013, Joyent, Inc. All rights reserved.
!  * Copyright (c) 2012 by Delphix. All rights reserved.
   */
  
  #ifndef _DT_IMPL_H
  #define _DT_IMPL_H
  
--- 24,34 ----
   * Use is subject to license terms.
   */
  
  /*
   * Copyright (c) 2013, Joyent, Inc. All rights reserved.
!  * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
   */
  
  #ifndef _DT_IMPL_H
  #define _DT_IMPL_H
  
*** 318,327 ****
--- 318,328 ----
          dtrace_flowkind_t dt_flow;      /* flow kind */
          const char *dt_prefix;  /* recommended flow prefix */
          int dt_indent;          /* recommended flow indent */
          dtrace_epid_t dt_last_epid;     /* most recently consumed EPID */
          uint64_t dt_last_timestamp;     /* most recently consumed timestamp */
+         boolean_t dt_has_sugar; /* syntactic sugar used? */
  };
  
  /*
   * Values for the user arg of the ECB.
   */