[clang] [LifetimeSafety] Mark all DeclRefExpr as usages of the corresp. origin (PR #154316)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

### Merge activity

* **Sep 5, 8:15 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/154316).


https://github.com/llvm/llvm-project/pull/154316