// grouping control dependencies. We don't want to report warnings for these
// ops, unless they belong to a control path between two side-effecting ops that
// should not have any dependencies.
bool IsIntermediateOp(IslandOp island) {
  // These two side-effect-free ops are known to be used for control dependency
  // grouping (e.g., in `BreakUpIslands` pass).
  return isa<TF::IdentityOp, TF::NoOp>(island.GetBody().front());
}