[llvm] [Uniformity] Fixed control-div early stop (PR #139667)

[Sameer Sahasrabuddhe via llvm-commits]

ssahasra wrote:

The disabled test needs to be re-enabled as commented before submitting. Also, can you please include the tests from this commit: https://github.com/llvm/llvm-project/tree/users/ssahasra/uniformity-more-tests

Just go ahead and cherry-pick that into this current PR.

https://github.com/llvm/llvm-project/pull/139667