drm/radeon: fix VGT_GS_INSTANCE_CNT register
This register was incorrect for evergreen and cayman.Signed-off-by: Dave Airlie <airlied@redhat.com>Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
authored by Dave Airlie and committed by Alex Deucher 12 years ago b7bc7999 1abd4986