[llvm] AMDGPU: Add instruction flags when lowering ctor/dtor (PR #111652)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Oct 9, 10:01 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/111652).


https://github.com/llvm/llvm-project/pull/111652