mesa: call FLUSH_VERTICES before updating CoordReplace

Reviewed-by: Mathias Fröhlich <mathias.froehlich@web.de>
Cc: 20.0 <mesa-stable@lists.freedesktop.org>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3947>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3947>
1 file changed