[llvm] [LVer][profcheck] explicitly set unknown branch weights for the versioned/unversioned selector (PR #164507)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Nov 5, 8:12 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/164507).


https://github.com/llvm/llvm-project/pull/164507