[llvm] [UniformityAnalysis] Replace DivergentValues with UniformValues for conservative divergence queries (PR #180509)

[Pankaj Dwivedi via llvm-commits]

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PankajDwivedi-25 wrote:

But such a utility doesn't exist in LLVM today. moving this to the IR specialization where haveDivergentArgs is local.

https://github.com/llvm/llvm-project/pull/180509