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I don't love deleting working code without a working replacement. But this impl is deeply questionable as-is, and will only balloon in complexity for shader objects. We need to go back to the drawing board with MDI and lower to real draws, possibly with control stream looping. Good news is that this is GL so we can prototype all this. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27616>