[llvm] [ObjectYAML][NFC] Extract BBAddrMap YAML types into shared namespace (PR #196019)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

Seems reasonable to me. I haven't attempted to verify that there are no functional changes. Can you confirm you've just moved code between files and not changed anything in the process, except the namespaces?

https://github.com/llvm/llvm-project/pull/196019