radv: initialize the DCC predicate correctly when it's compressed
We have to do a fast-clear eliminate when clearing DCC metadata with 0x20202020. I don't know if that fixes anything but that seems correct to me. CC: 18.2 <mesa-stable@lists.freedesktop.org> Signed-off-by:Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by:
Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> (cherry picked from commit f9e8456c)