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ir3: Do not set clip/cull mask if no one writes clip/cull

Danylo Piliaiev requested to merge Danil/mesa:fix/turnip/unread-clip-cull-in-fs into main

What does this MR do and why?

This may happen when undefined value is written into gl_ClipDistance, then it gets optimized out by nir_opt_undef.

Fixes GPU faults in Tropico 5 (D3D11) on at least A750.

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