auto succ = use.getOwner();
      successors.push_back(succ);
    }
  }
  return successors;
}
// Gets the predecessors of an op wrapped in tf_executor.island.
llvm::SmallVector<Operation*> GetPredecessors(Operation* op) {
  llvm::SmallVector<Operation*> predecessors;
  for (auto operand : op->getOperands()) {
    if (Operation* pred = operand.getDefiningOp()) {
      pred->walk([&](mlir::Operation* opinexecutor) {