i965: Increase the size of brw_stage_state::surf_offset.

Since BRW_MAX_WM_SURFACES is greater than BRW_MAX_VEC4_SURFACES, the
existing array isn't large enough to be used by the WM.  Increasing it
will make it possible to share them.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
1 file changed