[clang] [LifetimeSafety] Read lifetimebound attribute on implicit 'this' from all redeclarations (PR #176188)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

### Merge activity

* **Jan 19, 12:01 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/176188).


https://github.com/llvm/llvm-project/pull/176188