5045 use atomic_{inc,dec}_* instead of atomic_add_*

*** 1225,1242 ****
   * enable/disable collection of stats for hat.
   */
  int
  hat_stats_enable(hat_t *hat)
  {
!         atomic_add_32(&hat->hat_stats, 1);
          return (1);
  }
  
  void
  hat_stats_disable(hat_t *hat)
  {
!         atomic_add_32(&hat->hat_stats, -1);
  }
  
  /*
   * Utility to sync the ref/mod bits from a page table entry to the page_t
   * We must be holding the mapping list lock when this is called.
--- 1225,1242 ----
   * enable/disable collection of stats for hat.
   */
  int
  hat_stats_enable(hat_t *hat)
  {
!         atomic_inc_32(&hat->hat_stats);
          return (1);
  }
  
  void
  hat_stats_disable(hat_t *hat)
  {
!         atomic_dec_32(&hat->hat_stats);
  }
  
  /*
   * Utility to sync the ref/mod bits from a page table entry to the page_t
   * We must be holding the mapping list lock when this is called.