// to functions).
bool IsAlreadyOutlined(WhileOp while_op) {
  auto just_call = [](Region& region) {
    auto it = region.front().begin();
    if (!isa<func::CallOp>(*it)) return false;
    ++it;
    if (!isa<YieldOp>(*it)) return false;
    return true;
  };
  return just_call(while_op.getBody()) && just_call(while_op.getCond());
}

bool IsCompatibleTypeWithTFLCastOp(Type type) {