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nir: add txs lowering and make use of it

Christian Gmeiner requested to merge austriancoder/mesa:textureSize into main

What does this MR do and why?

This MR adds a NIR based txs lowering that is needed for GPUs without txs HW support. It passes all dEQP-GLES3.functional.shaders.texture_functions.texturesize.* tests on etnaviv. Broadcom compiler could also benefit from it but I first want to get some feedback before

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