OS-7753 THREAD_KPRI_RELEASE does nothing of the sort
Reviewed by: Bryan Cantrill <bryan@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 701,711 ****
                          return (NULL);
                  ASSERT(p == pcp->prc_proc);
                  mutex_enter(&p->p_lock);
          }
          p->p_proc_flag |= P_PR_LOCK;
-         THREAD_KPRI_REQUEST();
          return (p);
  }
  
  /*
   * Lock the target process by setting P_PR_LOCK and grabbing p->p_lock.
--- 701,710 ----
*** 808,818 ****
          ASSERT(p->p_proc_flag & P_PR_LOCK);
          ASSERT(MUTEX_HELD(&p->p_lock));
  
          cv_signal(&pr_pid_cv[p->p_slot]);
          p->p_proc_flag &= ~P_PR_LOCK;
-         THREAD_KPRI_RELEASE();
  }
  
  void
  prunlock(prnode_t *pnp)
  {
--- 807,816 ----