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Now both GLSL and SPIR-V will produce the scoped barriers, so no need to handle the old ones. Control barriers are still present in some cases, so keep that for now. Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3339>