[clang] [CodeGen][ObjC] Include all referenced protocols in protocol list (PR #148827)

[David Chisnall via cfe-commits]

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

Looks good to me, thank you.

There's a clang-format error, but once that's fixed we should be good to merge it.

https://github.com/llvm/llvm-project/pull/148827