5042 stop using deprecated atomic functions

*** 1643,1653 ****
          klwp_t *lwp = ttolwp(curthread);
          struct prof *pr = &p->p_prof;
  
          do {
                  ticks = lwp->lwp_oweupc;
!         } while (cas32(&lwp->lwp_oweupc, ticks, 0) != ticks);
  
          mutex_enter(&p->p_pflock);
          if (pr->pr_scale >= 2 && upc >= pr->pr_off) {
                  /*
                   * Old-style profiling
--- 1643,1653 ----
          klwp_t *lwp = ttolwp(curthread);
          struct prof *pr = &p->p_prof;
  
          do {
                  ticks = lwp->lwp_oweupc;
!         } while (atomic_cas_32(&lwp->lwp_oweupc, ticks, 0) != ticks);
  
          mutex_enter(&p->p_pflock);
          if (pr->pr_scale >= 2 && upc >= pr->pr_off) {
                  /*
                   * Old-style profiling