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zink: workaround UB for swizzle 1 one some IMG hw by extending shadow shader swizzles

Soroush Faghihi requested to merge Soroush/mesa:zink-zs-swiz1-workaround into main

Using swizzle 1 with combined depth/stencil can return undefined results on some of the Imagination hw. Since shader swizzling exists for shadow samplers, extend that pass as a workaround for the UB.

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