[llvm] [Uniformity] Implement per-output machine uniformity analysis (PR #179275)

[Sameer Sahasrabuddhe via llvm-commits]

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ssahasra wrote:

So the idea is that if the def is not virtual, then that register itself says whether it is uniform or divergent, and hence it is independent of the defining instruction. Is that correct?

https://github.com/llvm/llvm-project/pull/179275