3654 zdb should print number of ganged blocks
3655 ::rrwlock and ::refcount print errors on non-debug kernels
3656 remove unused function zap_cursor_move_to_key()
3657 mdb_ctf_vread() should allow conversion of pointer to uintptr_t
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Garrett D'Amore <garrett@damore.org>