Rather than adding another boolean to optionally lower PLS vars, pass the types we want to lowers through a nir_variable_mode bitmask. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Eric R. Smith <eric.smith@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37110>