message: CLN: use StrCat
diff: @@ -258,10 +258,10 @@ Status RestoreTensorsV2(OpKernelContext* context, const Tensor& prefix,
  reader.LookupDtypeAndShape(tensor_name,
  &original_dtype, &restored_full_shape));
  if (dtypes[i] != original_dtype) {
  - string error_msg = string("tensor_name = ") + tensor_name +
  - "; expected dtype " + DataTypeString(dtypes[i]) +
  - " does not equal original dtype " +
  - DataTypeString(original_dtype) + '\n';
  + string error_msg = strings::StrCat(
  + "tensor_name = ", tensor_name,
  + "; expected dtype ", DataTypeString(dtypes[i]),
  + " does not equal original dtype ", DataTypeString(original_dtype));
  mismatched_errors.emplace_back(error_msg);
  }
  }
  