[llvm] [coro] Fix crash due to DILabel in `LineTableOnly` mode (PR #148095)

[Alexander Kornienko via llvm-commits]

alexfh wrote:

> > Please add a regression test.
> 
> Added a test case. Let me know if you are happy with that. If you are happy with the test case, feel free to hit "Squash and Merge" on my behalf. I would not be planning any other changes and this PR would be ready for merging. (Assuming that CI comes back green, of course. But it passed on my local machine, at least)

Thanks! This looks good to me. I'd probably add a test from https://github.com/llvm/llvm-project/pull/141937#issuecomment-3057320828 or a similar one that makes clang without this fix crash, but that can be done separately from this fix, which I would prefer to submit now to unblock our testing.

https://github.com/llvm/llvm-project/pull/148095