- machine/mutex.h -> sys/mutex.h - The initial lock_mtx mutex used in the lockmgr code is initialized very   early, so use MUTEX_DECLARE() and MTX_COLD.
- machine/mutex.h -> sys/mutex.h
- The initial lock_mtx mutex used in the lockmgr code is initialized very
  early, so use MUTEX_DECLARE() and MTX_COLD.

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