13752 stat: variable may be used uninitialized
Reviewed by: C Fraire <cfraire@me.com>
Reviewed by: Sebastian Wiedenroth <sebastian.wiedenroth@skylime.net>
Approved by: Dan McDonald <danmcd@joyent.com>

1186 integrate arcstat
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>
Approved by: Robert Mustacchi <rm@joyent.com>