 - Acquire lk in softdep_slowdown so that it's owned when we call    softdep_speedup().  - Assert that lk is held in softdep_speedup() rather than acquiring it.    This avoids a potential lock recursion.
 - Acquire lk in softdep_slowdown so that it's owned when we call
   softdep_speedup().
 - Assert that lk is held in softdep_speedup() rather than acquiring it.
   This avoids a potential lock recursion.

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