adad576bfc
radeonsi also does the same thing. I suspect that this is likely to be a no-op in reality, but it brings nouveau code closer to what the blob produces. Plus it makes sense to not try to do auto-derivatives on this. Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>