[clang] [CIR] Fix record layout for [[no_unique_address]] fields (PR #186701)

[Erich Keane via cfe-commits]

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

I'm happy, though Andy had a comment that was left unanswered.  Can you answer that? 

https://github.com/llvm/llvm-project/pull/186701