radv: add separate fmask tile swizzle counter.

This mirrors what Marek has done for radeonsi, and uses
a separate counter to handle the fmask surface for MSAA
MRTs.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
3 files changed