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This will allow us to disable the GLSL IR loop unroller in a following patch and rely on the NIR loop unroller instead. This allows the piglit test spec@!opengl 2.0@max-samplers border to pass on the v3d rpi4 driver. Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16543>