message: Fix a bug:
  #elif MFEM_USE_HIP  -->  #elif defined(MFEM_USE_HIP)
diff: @@ -1654,9 +1654,9 @@ int MemoryManager::CompareHostAndDevice_(void *h_ptr, size_t size,
  mm.GetAliasDevicePtr(h_ptr, size, false) :
  mm.GetDevicePtr(h_ptr, size, false);
  char *h_buf = new char[size];
  -#ifdef MFEM_USE_CUDA
  +#if defined(MFEM_USE_CUDA)
  CuMemcpyDtoH(h_buf, d_ptr, size);
  -#elif MFEM_USE_HIP
  +#elif defined(MFEM_USE_HIP)
  HipMemcpyDtoH(h_buf, d_ptr, size);
  #else
  std::memcpy(h_buf, d_ptr, size);
  