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nir: restrict instruction rewrite on matching bit sizes

Lionel Landwerlin requested to merge llandwerlin/mesa:review/nir-opt-cse-matching-ssa-bit into main

Running into a phi instructions will get rewritten but ssa defs don't have matching bit sizes. This fails validation immediately after the opt_cse pass.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Cc: mesa-stable

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