[llvm] [InstCombine] Detect uadd with overflow idiom (PR #140178)

[via llvm-commits]

AZero13 wrote:

> I have asked you repeatedly in the past to not force push unless you absolutely have to. If you need to update to latest main you should make a merge commit. This is documented in our development policies https://llvm.org/docs/GitHub.html#updating-pull-requests

They are merged as one, so no need for every commit to be perfect? Well, that makes everything easier...

https://github.com/llvm/llvm-project/pull/140178