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Enabling this option by default allows the nir_opt_move_discards_to_top to be used more often. This is only done for LLVM13+ since doing this on LLVM11 hurts a lot of shaders. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10522>