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ir3: Use NIR info to enable per sample shading

Danylo Piliaiev requested to merge Danil/mesa:fix/turnip/implicit-sample-shading into main

What does this MR do and why?

NIR is tracking whether to enable per sample shading better than us.

New CTS tests seem to add the requirement where in the presence of some builtin's like gl_SampleID in a shader, even if unused, sample shading is expected to be enabled.

See https://gitlab.khronos.org/Tracker/vk-gl-cts/-/issues/3712

Fixes:

 dEQP-VK.draw.*.implicit_sample_shading.sample_id_static_use
 dEQP-VK.draw.*.implicit_sample_shading.sample_position_static_use

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