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zink: clone shader before lowering clip_halfz

Erik Faye-Lund requested to merge kusma/mesa:zink-fix-halfz into master

If we don't clone the shader before lowering clip_halfz, we risk ending up performing the same lowering multiple times, each time we compile a new variant.

This fixes rendering in Neverball.

Fixes: 15f478fe ("zink: only run nir_lower_clip_halfz for last vertex processing stage") Closes: #4147 (closed)

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