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radv: Fix rasterization precision bits.

Bas Nieuwenhuizen requested to merge bnieuwenhuizen/mesa:precision-fix into master

Note that these limits are exact, not a "precision is at least x", as texel coords also get snapped to a multiple of this step size before filtering.

This fixes CTS tests

dEQP-VK.texture.explicit_lod.2d.sizes.31x55_nearest_linear_mipmap_nearest_repeat
dEQP-VK.texture.explicit_lod.2d.sizes.57x35_nearest_linear_mipmap_nearest_repeat

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109151

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