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5042 stop using deprecated atomic functions

@@ -215,11 +215,11 @@
 rw_panic(char *msg, rwlock_impl_t *lp)
 {
         if (panicstr)
                 return;
 
-        if (casptr(&panic_rwlock_addr, NULL, lp) == NULL)
+        if (atomic_cas_ptr(&panic_rwlock_addr, NULL, lp) == NULL)
                 panic_rwlock = *lp;
 
         panic("%s, lp=%p wwwh=%lx thread=%p",
             msg, (void *)lp, panic_rwlock.rw_wwwh, (void *)curthread);
 }