5042 stop using deprecated atomic functions

*** 548,558 ****
           */
          if (t->t_intr_start) {
                  do {
                          start = t->t_intr_start;
                          interval = CLOCK_TICK_COUNTER() - start;
!                 } while (cas64(&t->t_intr_start, start, 0) != start);
                  cpu = CPU;
                  if (cpu->cpu_m.divisor > 1)
                          interval *= cpu->cpu_m.divisor;
                  cpu->cpu_m.intrstat[t->t_pil][0] += interval;
  
--- 548,558 ----
           */
          if (t->t_intr_start) {
                  do {
                          start = t->t_intr_start;
                          interval = CLOCK_TICK_COUNTER() - start;
!                 } while (atomic_cas_64(&t->t_intr_start, start, 0) != start);
                  cpu = CPU;
                  if (cpu->cpu_m.divisor > 1)
                          interval *= cpu->cpu_m.divisor;
                  cpu->cpu_m.intrstat[t->t_pil][0] += interval;
  
*** 575,585 ****
          ASSERT((t->t_flag & T_INTR_THREAD) != 0);
          ASSERT(t->t_pil > 0 && t->t_pil <= LOCK_LEVEL);
  
          do {
                  ts = t->t_intr_start;
!         } while (cas64(&t->t_intr_start, ts, CLOCK_TICK_COUNTER()) != ts);
  }
  
  
  int
  blacklist(int cmd, const char *scheme, nvlist_t *fmri, const char *class)
--- 575,586 ----
          ASSERT((t->t_flag & T_INTR_THREAD) != 0);
          ASSERT(t->t_pil > 0 && t->t_pil <= LOCK_LEVEL);
  
          do {
                  ts = t->t_intr_start;
!         } while (atomic_cas_64(&t->t_intr_start, ts, CLOCK_TICK_COUNTER()) !=
!             ts);
  }
  
  
  int
  blacklist(int cmd, const char *scheme, nvlist_t *fmri, const char *class)