message: Fix tensorflow::data::model::SharedStatefield initializer order to avoid warnings.
  The fields will be initiwalized in the order in which they are declared in the struct
  regardless of the order the initializers are listed, but some compilers warn if the orderings do not match.
  This CL makes tham match to avoid the warnings.
diff: @@ -39,7 +39,7 @@ struct SharedState {
  public:
  explicit SharedState(int64 value, std::shared_ptr<mutex> mu,
  std::shared_ptr<condition_variable> cond_var)
  - : value(value), mu(std::move(mu)), cond_var(std::move(cond_var)) {}
  + : mu(std::move(mu)), cond_var(std::move(cond_var)), value(value) {}
  std::shared_ptr<mutex> mu;
  std::shared_ptr<condition_variable> cond_var;
  