[llvm] [SimplifyCFG][profcheck] Synthesize profile for `br (X == 0 | X == 1), T, F1 -> switch` (PR #161549)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Oct 4, 2:59 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/161549).


https://github.com/llvm/llvm-project/pull/161549