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We are about to add support for scoped control+memory barriers. Let's move the convert from SPIRV to NIR enums logic in helpers so we can easily re-use them. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4900>