[llvm] [Support] Ensure complete type DelimitedScope (PR #127459)

[Jonas Hahnfeld via llvm-commits]

hahnjo wrote:

Thanks @dwblaikie for merging. In the future, I would prefer to merge PRs myself though because now the commit in the repository has the wrong email address (my work one, not my private dev address as I contributed this outside work time). I was very surprised this morning to have 60+ emails in my work inbox from buildbots (not this change though)...

https://github.com/llvm/llvm-project/pull/127459