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amd: lower load sysval intrinsics in ac_nir_lower_intrinsics_to_args instead of drivers/ACO/ac_nir_to_llvm

Marek Olšák requested to merge mareko/mesa:ac-lower-sysvals-in-nir into main

This unifies intrinsic lowering between RADV and radeonsi by moving it into ac_nir_lower_intrinsics_to_args.

Thanks to NIR and improvements in the lowering over what ACO did, it results in -0.71% code size reduction in affected shaders for radeonsi+ACO. (26056 affected / 58359 total)

It also results in shorter and more readable code. The diff stat added-removed = -721 lines of code in total, and -479 just in ACO.

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