[llvm] [SimplifyCFG][profcheck] Profile propagation for `indirectbr` (PR #161747)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Oct 6, 7:09 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/161747).


https://github.com/llvm/llvm-project/pull/161747