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

[Jay Foad via llvm-commits]

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jayfoad wrote:

This is only a minor point, but it really seems silly to use a member variable for this when all the information you need is already available locally in `print`. As Sameer said, by the time you get to the end of that function, you know whether or not you have found any reason to print "DIVERGENT". If not, you can print "ALL VALUES UNIFORM".

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