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NIR format conversion helpers

Emma Anholt requested to merge anholt/mesa:nir-format-convert into master

The Intel shader image load/store lowering created a bunch of NIR helpers for format conversion, but for V3D's store lowering I wanted even more of the Intel code shared.

I do wonder if we could generalize even more -- see https://gitlab.freedesktop.org/anholt/mesa/commits/v3d-cs for my lowering pass. Note that the Intel side here hasn't actually been tested yet. My laptop died for unrelated reasons before my deqp run completed.

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