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turnip: Avoid the old-descriptors memcpy on CmdPushDescriptorSetWithTemplate.

Emma Anholt requested to merge anholt/mesa:tu-template-full into main

If the template updates every descriptor, then we don't need the old descriptors in our new push descriptor space before we apply the template. That memcpy was from WC memory, which is very expensive. Improves gfxbench gl_driver2 under zink from 74 fps to 102 fps.

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