- In the locking key for struct proc, generalize the '+' symbol to mean

  that write access to a member requires both locks and read access only
  requires one of the given locks.  Convert instances of '(c+)' to
  '(c + k)' as a result.
- Change p_pptr from (e) to (c + e).
- Change p_oppid from (c) to (c + e).
- Change p_args from (b?) to (c + k).
- Move the actual work of STOPEVENT, PHOLD, and PRELE to _STOPEVENT,
  _PHOLD, and _PRELE.  The new macros do not acquire the proc lock and
  simply assert that it is held.  The non _ prefixed macros acquire the
  proc lock and then call the _ prefixed macros.
- Add a PROC_LOCK_NOSWITCH() macro to be used when releasing the proc lock
  while already holding a spin lock (usually sched_lock).
- Add a PROC_LOCK_ASSERT() macro to be used to make assertions about the
  proc lock.  It takes the usual mtx_assert() macro arguments as its
  second argument.

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