- In sched_sync() test our preconditions prior to dropping the sync_mtx.

   This is so that we may grab the interlock while still holding the
   sync_mtx.  We have to VI_TRYLOCK() because in all other cases the lock
   order runs the other way.
 - If we don't meet any of the preconditions, reinsert the vp into the
   list for the next second.
 - We don't need to panic if we fail to sync here because each FSYNC
   function handles this case.  Removing this redundant code also
   simplifies locking.

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