patch as-lock-macro-simplification

*** 645,655 ****
      struct cred *cr, caller_context_t *ct)
  {
          page_t *pp;
  
          ASSERT(len == PAGESIZE);
!         ASSERT(AS_READ_HELD(seg->s_as, &seg->s_as->a_lock));
  
          /*
           * If the page is in the hash, then we successfully claimed this
           * page earlier, so return it to the caller.
           */
--- 645,655 ----
      struct cred *cr, caller_context_t *ct)
  {
          page_t *pp;
  
          ASSERT(len == PAGESIZE);
!         ASSERT(AS_READ_HELD(seg->s_as));
  
          /*
           * If the page is in the hash, then we successfully claimed this
           * page earlier, so return it to the caller.
           */