Function deserialize

deps/GraphBLAS/CUDA/jitify.hpp:3640–3645

}

inline bool deserialize(std::istream& stream, size_t* size) {
  uint64_t u64;
  stream.read(reinterpret_cast<char*>(&u64), sizeof(u64));
  *size = u64;
  return stream.good();
}

inline void serialize(std::ostream& stream, std::string const& s) {
  serialize(stream, s.size());