6583 remove whole-process swapping

@@ -1213,12 +1213,10 @@
         nrp->req = req;
         nrp->cr = cr;
         nrp->ro = ro;
         nrp->thread = curthread;
 
-        ASSERT(curthread->t_schedflag & TS_DONT_SWAP);
-
         /*
          * Look to see if there is already a cluster started
          * for this file.
          */
         mutex_enter(&rfs_async_write_lock);