[llvm] [OpenMP] Add test to print interop identifiers (PR #161434)

[Michael Halkenhäuser via llvm-commits]

https://github.com/mhalk approved this pull request.

> @mhalk can you have a look and accept?

Sure, this LGTM -- passed on my system as expected :)

@adurang I did not see a PR wr.t. the `target` / `targetsync` issue or the referenced commit.
Thus, I'll accept this PR as-is. When your referenced changes are merged we can revisit this test and adapt it accordingly.

https://github.com/llvm/llvm-project/pull/161434