Mark Johnston d0f68f913b Correct the predicates on which lockstat:::{thread,spin}-spin fire.
In particular, they should fire only if the lock was owned by another
thread when we first attempted to acquire that lock.

MFC after:	1 week
2017-07-31 00:59:28 +00:00
..
2017-07-30 21:52:22 +00:00
2017-07-28 22:23:29 +00:00
2017-07-30 21:52:22 +00:00
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