4374 dn_free_ranges should use range_tree_t
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Max Grossman <max.grossman@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Dan McDonald <danmcd@omniti.com>

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2012 by Delphix. All rights reserved.
   * Copyright (c) 2013, Joyent, Inc.  All rights reserved.
   */
  
  #include <assert.h>
  #include <fcntl.h>
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
   * Copyright (c) 2013, Joyent, Inc.  All rights reserved.
   */
  
  #include <assert.h>
  #include <fcntl.h>
*** 770,793 ****
  }
  
  /*
   * Find highest one bit set.
   *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
-  * High order bit is 31 (or 63 in _LP64 kernel).
   */
  int
! highbit(ulong_t i)
  {
!         register int h = 1;
  
          if (i == 0)
                  return (0);
! #ifdef _LP64
!         if (i & 0xffffffff00000000ul) {
                  h += 32; i >>= 32;
          }
- #endif
          if (i & 0xffff0000) {
                  h += 16; i >>= 16;
          }
          if (i & 0xff00) {
                  h += 8; i >>= 8;
--- 770,790 ----
  }
  
  /*
   * Find highest one bit set.
   *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
   */
  int
! highbit64(uint64_t i)
  {
!         int h = 1;
  
          if (i == 0)
                  return (0);
!         if (i & 0xffffffff00000000ULL) {
                  h += 32; i >>= 32;
          }
          if (i & 0xffff0000) {
                  h += 16; i >>= 16;
          }
          if (i & 0xff00) {
                  h += 8; i >>= 8;