[llvm] [LV] Don't simplify wide binops to constants if non-uniform (PR #121898)

[Antonio Frighetto via llvm-commits]

https://github.com/antoniofrighetto approved this pull request.

Thanks for fixing it, this makes sense to me. Let's wait for Florian's feedback as well.

https://github.com/llvm/llvm-project/pull/121898