[clang] [CIR] Fix a problem with cleanup active flag initialization (PR #225507)

[Erich Keane via cfe-commits]

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

Actually, looks good anyway, but I screwed up and merged this instead of a different patch thanks to having multiple tabs open.  I think this all makes sense but sorry :( 

https://github.com/llvm/llvm-project/pull/225507