ac/nir: Only clamp shadow reference on radeonsi.
Vulkan CTS does not expect the value to be clamped (at least for D32), and it makes a differences even though depth is in [0,1], due to strict inequalities. I couldn't find anything in the Vulkan spec about this, but the test seemed to be copied from GL tests and the GL spec only specifies clamping for fixed point formats. Hence I expect radeonsi to run into this at some point as well, but given that they still have a usecase with the Z16->Z32 promotion, I'll leave that for someone else to clean up. This at least fixes radv dEQP-VK.texture.shadow.* on VI. Fixes: 0f9e3251 'ac/nir: clamp shadow texture comparison value on VI' Reviewed-by: Dave Airlie <email@example.com>
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