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glsl: Replace lower_tess_levels with NIR

Emma Anholt requested to merge anholt/mesa:glsl-tess into main

Slightly extending a little bit of NIR code to delete 400 lines of GLSL IR code.

I've tried all but the last commit in CI, this could probably use some testing on non-CI drivers (including nouveau, whose CI can't run any deqp tess tests due to SSBO instability on tegra)

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