6808ccf23a
It's been unused for years. Back on the brw driver, it was used for a ~1% win on a VS-heavy workload, because you could hide instruction latency using a DP4 sequence instead of MADs for doing the MVP transform. Given that r300 and i915 don't seem to want it, and nobody has successfully ported it for crocus (see https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14277), just garbage collect the code at this point. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35617>