[clang] [CIR]/[OGCG] Fix handling of bool-backed-scoped-enums (PR #214084)

[Aaron Ballman via cfe-commits]

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

Thank you for the fix, can you also add a release note to `clang/docs/ReleaseNotes.md`?

Otherwise, LGTM with just nits.

https://github.com/llvm/llvm-project/pull/214084