[llvm] [NFC][SLU] Update SimpleLoopUnswitch/guards.ll (PR #166285)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Nov 4, 6:59 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/166285).


https://github.com/llvm/llvm-project/pull/166285