3752 want more verifiable dbuf user eviction
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Submitted by:   Will Andrews <willa@spectralogic.com>

*** 240,249 ****
--- 240,250 ----
          zrlock_t dnh_zrlock;
          dnode_t *dnh_dnode;
  } dnode_handle_t;
  
  typedef struct dnode_children {
+         dmu_buf_user_t db_evict;        /* User evict data */
          size_t dnc_count;               /* number of children */
          dnode_handle_t dnc_children[1]; /* sized dynamically */
  } dnode_children_t;
  
  typedef struct free_range {