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

[Haohai Wen via llvm-commits]

HaohaiWen wrote:

> 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?

Yes.  One minor diff is
static void mapping(IO &IO, ELFYAML::PGOAnalysisMapEntry &Rel)
=>
static void mapping(IO &IO, ELFYAML::PGOAnalysisMapEntry &E)

Renamed the declaration name for PGOAnalysisMapEntry from Rel -> E to match the implementation name in .cpp.

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