message: add get_ptr in genenral_buffer
diff: @@ -221,6 +221,7 @@ class GeneralBuffer2 : public std::enable_shared_from_this<GeneralBuffer2<Alloca
  bool allocated() const { return total_size_in_bytes_ != 0 && ptr_ != nullptr; }
  + void *get_ptr() const {return ptr_;}
  }; // namespace HugeCTR
  } // namespace HugeCTR
  \ No newline at end of file
  