[llvm] [NFC][InstCombine] Make use of `unknown` profile info clear in the API name (PR #162766)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Oct 10, 4:32 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/162766).


https://github.com/llvm/llvm-project/pull/162766