[clang] [LifetimeSafety] Associate origins to all l-valued expressions (PR #156896)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

### Merge activity

* **Sep 11, 1:50 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/156896).


https://github.com/llvm/llvm-project/pull/156896