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nir: Extending divergence info to registers

Kenneth Graunke requested to merge kwg/mesa:ibc-nir into master

Here's a patch from Jason to extend divergence info into registers which can be useful for backends like IBC that want to go out-of-SSA for values tangled in phi-webs, but still want divergence info.

(Tagging ACO since it since it uses the divergence passes and the developers may be interested, no actual ACO patches though.)

Edited by Emma Anholt

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