As explained at the header of the lowering:
"Once this pass is done, the color write will either have one
component (for single sample) with packed argb8888, or 4 components
with the per-sample argb8888 result."
So in several cases the lowering was updating the number of
components, so we need to update the writemask too.
Reviewed-by: Juan A. Suarez <jasuarez@igalia.com>
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14708>
4ab6631949