[clang] [LifetimeSafety] Use source ranges instead of end locations in diagnostics (PR #177020)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

### Merge activity

* **Jan 21, 11:37 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/177020).


https://github.com/llvm/llvm-project/pull/177020