[llvm] [Reassociate] Use UniformityInfo to group uniform operands together (PR #198507)

[Pankaj Dwivedi via llvm-commits]

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PankajDwivedi-25 wrote:

I think we do want divergence at the use here rather than at the definition, because of temporal divergence.

https://github.com/llvm/llvm-project/pull/198507