[llvm] [SimplifyCFG] Set branch weights when merging conditional store to address (PR #154841)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

### Merge activity

* **Sep 11, 8:20 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/154841).


https://github.com/llvm/llvm-project/pull/154841