[llvm] [NaryReassociate] Teach NaryReassociate about UniformityAnalysis (PR #175167)

[Christudasan Devadasan via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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cdevadas wrote:

Can you precommit this test? The new changes introduced by this patch would be easier to review with that.

https://github.com/llvm/llvm-project/pull/175167