Suggested by Johannes: Ideally it should be `const` (The CUDA counterpart uses `const`), but the source in HIP [API](https://dec4.readthedocs.io/en/latest/ROCm_API_References/HIP_API/Memory-Management.html#hipmemcpyhtod) is not a constant pointer. There is an effort to change the HIP API, and after that we could modify the Orochi API by adding const.
