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nir/lower_phis_to_scalar: Handle undef and const better.

Timur Kristóf requested to merge Venemo/mesa:nir_phis_to_scalar_improvement into main

This addresses the situation when we have a vector phi and there are some components which are undef or const in both sides of the phi.

In this case, we can safely emit an undef or const for those components after the phis, resulting in slightly better code generation in ACO.

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