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nir: Add AGX atomic intrinsics

Alyssa Rosenzweig requested to merge alyssa/mesa:nir/agx-atomics into main 
Like our loads and stores, our global atomics support indexing with a 64-bit
base plus a 32-bit element index, zero- or sign-extended and multiplied by the
word size. Unlike the loads and stores, they do not support additional shifting
(it's not too useful), so that needs an explicit lowering.

Switch to using AGX variants of the atomics, running our address pattern
matching on global atomics in order to delete some ALU.

This cleans up the image atomic lowering nicely, since we get to take full
advantage of the shift + zero-extend + add on the atomic... The shift comes from
multiplying by the bytes per pixel.

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