- If our user_pri doesn't match our actual priority our priority has been

 - If our user_pri doesn't match our actual priority our priority has been
   elevated either due to priority propagation or because we're in the
   kernel in either case, put us on the current queue so that we dont
   stop others from using important resources.  At some point the priority
   elevations from sleeping in the kernel should go away.
 - Remove an optimization in sched_userret().  Before we would only set
   NEEDRESCHED if there was something of a higher priority available.  This
   is a trivial optimization and it breaks priority propagation because it
   doesn't take threads which we may be blocking into account.  Notice that
   the thread which is blocking others gets up to one tick of cpu time before
   we honor this NEEDRESCHED in sched_clock().