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nir/opt_shrink_vectors: remove duplicate components

Daniel Schürmann requested to merge daniel-schuermann/mesa:nir_shrink_vectors into main

This series further enhances the previous work from !11411 (merged) by

  • removing arbitrary channels from load_const
  • removing duplicates from load_const
  • removing duplicates from vecN
  • performing a per-component DCE to detect unused channels

The last addition drastically increases the run-time of this pass, so it might be an idea to pull it out of optimization loops.

Edited by Daniel Schürmann

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