Used by RADV/Radeonsi NGG culling. Pack them into a single vec4 load for radeonsi to reduce const buffer load. Acked-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Timur Kristóf <timur.kristof@gmail.com> Signed-off-by: Qiang Yu <yuq825@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17651>