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nir,amd: add image_samples_identical and *_descriptor NIR intrinsics, lower resinfo in NIR for AMD

Marek Olšák requested to merge mareko/mesa:nir-descriptor-resinfo into main

Emulating the AMD instruction image_get_resinfo should be is faster than using the hw. This MR implement that.

image_samples_identical will be used by radeonsi later.

The new descriptor intrinsics might help bridge the gap between ACO and LLVM.

Edited by Marek Olšák

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