Function serialize

deps/GraphBLAS/CUDA/jitify.hpp:3635–3638

static constexpr const size_t kSerializationVersion = 1;

inline void serialize(std::ostream& stream, size_t u) {
  uint64_t u64 = u;
  stream.write(reinterpret_cast<char*>(&u64), sizeof(u64));
}

inline bool deserialize(std::istream& stream, size_t* size) {
  uint64_t u64;