- Split p_flag up into two fields. p_flag keeps most of the previous flags

  and is protected by the proc lock.  p_sflag is protected by sched_lock
  and holds the following flags: PS_INMEM, PS_OWEUPC, PS_PROFIL, PS_SINTR,
  PS_TIMEOUT, PS_ALRMPEND, PS_PROFPEND, PS_CVWAITQ, PS_SWAPINREQ, and
  PS_SWAPPING.
- p_klist is definitely locked now by the proc lock.
- p_runtime, p_[usi]u are locked by sched_lock.
- Add a new P_KTHREAD flag set for kernel threads created via
  kthread_create(9).
- STOPEVENT() only needs the proc lock, it does not need Giant.
- faultin() already checks PS_INMEM, so simplify the check in PHOLD() so
  that we only need to grab the proc lock and let faultin() perform the
  PS_INMEM check.
- Add a prototype for zpfind().
- Add prototypes for the new fork_exit() and fork_return() MI functions
  that manage the fork return path.
- Add a prototype for the MD function userret() so that it can be called
  from fork_return().
- Add needed include of <machine/frame.h> in the kernel.

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