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mesa: Switch ATI_fragment_shader to NIR.

Emma Anholt requested to merge anholt/mesa:st-atifs-nir into master 
    st/mesa: Generate NIR for ATI_fragment_shader instead of TGSI.
    
    Compiling NIR is much less code, gives us optimization across drivers, and
    is one less chunk of TGSI in the mesa frontend.

The real payoff for this series is once !8044 (merged) lands too, as TGSI ATI_fs was keeping a big pile of gross code around in that MR.

See also piglit!434 (merged)

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