message: add comment to cwise_ops.h for std::abs special case
diff: @@ -366,6 +366,8 @@ struct google_floor_div {
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const T operator()(const T& x,
  const T& y) const {
  if ((x < T(0)) != (y < T(0))) {
  +// HIP does not have the device version of the abs routine defined
  +// for all datatypes that T can resolve to
  #if defined(__HIP_DEVICE_COMPILE__)
  T abs_x = (x < T(0)) ? -x : x;
  T abs_y = (y < T(0)) ? -y : y;
  