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

*** 23,32 ****
--- 23,36 ----
  #
  # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
  
+ #
+ # Copyright (c) 2014 by Delphix. All rights reserved.
+ #
+ 
  require 5.8.4;
  
  $PNAME = $0;
  $PNAME =~ s:.*/::;
  $USAGE = "Usage: $PNAME [file ...]\n";
*** 129,149 ****
                  if (/^{}$/) {
                          next;
                  }
  
                  if (!/^enum/ && !/^\t*struct/ && !/^\t*union/ && !/^typedef/ &&
!                     !/^translator/ && !/^provider/) {
                          if (/[\w\s]+{/) {
                                  err "left brace not on its own line";
                          }
  
                          if (/{[\w\s]+/) {
                                  err "left brace not on its own line";
                          }
                  }
  
!                 if (!/;$/) {
                          if (/[\w\s]+}/) {
                                  err "right brace not on its own line";
                          }
  
                          if (/}[\w\s]+/) {
--- 133,154 ----
                  if (/^{}$/) {
                          next;
                  }
  
                  if (!/^enum/ && !/^\t*struct/ && !/^\t*union/ && !/^typedef/ &&
!                     !/^translator/ && !/^provider/ && !/\tif / &&
!                     !/ else /) {
                          if (/[\w\s]+{/) {
                                  err "left brace not on its own line";
                          }
  
                          if (/{[\w\s]+/) {
                                  err "left brace not on its own line";
                          }
                  }
  
!                 if (!/;$/ && !/\t*}$/ && !/ else /) {
                          if (/[\w\s]+}/) {
                                  err "right brace not on its own line";
                          }
  
                          if (/}[\w\s]+/) {