Close a race condition where if we were obtaining a sleep lock and no spin

locks were held, we could be preempted and switch CPU's in between the time
that we set a variable to the list of spin locks on our CPU and the time
that we checked that variable to ensure no spinlocks were held while
grabbing a sleep lock.  Losing the race resulted in checking some other
CPU's spin lock list and bogusly panicing.

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