[XLA] Fix condition in slow_operation_alarm.

I inverted an if condition and was firing the alarm if the deadline *had not*
passed.  Oops.

PiperOrigin-RevId: 260239890

tensorflow/compiler/xla/service/slow_operation_alarm.cc

@@ -44,7 +44,7 @@ void AlarmLoop() {
       auto next = std::next(it);
       auto* alarm = *it;
       // Fire the alarm if applicable.
-      if (alarm->deadline() >= now) {
+      if (alarm->deadline() <= now) {
         outstanding_alarms->erase(it);
         int64 count =
             alarm->counter() == nullptr ? 0 : alarm->counter()->fetch_add(1);