[clang] [llvm] [OpenMP][Clang] Parsing/Sema support for `use_device_ptr(fb_preserve/fb_nullify)`. (2/4) (PR #170578)

[Abhinav Gaba via cfe-commits]

abhinavgaba wrote:

### Merge activity

* **Jan 16, 6:53 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/170578).


https://github.com/llvm/llvm-project/pull/170578