Method serialize

deps/GraphBLAS/CUDA/jitify.hpp:3844–3847

! Save the program. * * \see deserialize */

   * \see deserialize
   */
  std::string serialize() const {
    // Note: Must update kSerializationVersion if this is changed.
    return serialization::serialize(_name, _options, _sources);
  };

  /*! Select a kernel.
   *