message: Small optimization for the calculation of element reuse.
  We can break a loop early if we have already found an element reuse.
diff: @@ -3370,6 +3370,11 @@ class HloInstruction::FusionReusesParamElements {
  // that.
  value_it = cache->find(&hlo);
  value_it->second = new_val;
  + // Fold() minimizes the UseKind value. If it is already minimum, we can
  + // break the loop early.
  + if (new_val == UseKind::kReuse) {
  + break;
  + }
  }
  }
  return value_it->second;
  