Function swap

common/internal/byte_string.h:342–346

  }

  friend void swap(ByteString& lhs, ByteString& rhs) {
    if (&lhs != &rhs) {
      lhs.Swap(rhs);
    }
  }

  template <typename H>
  friend H AbslHashValue(H state, const ByteString& byte_string) {