[llvm] [llvm-readobj] Dump callgraph section info for ELF (PR #157499)

[Paul Kirth via llvm-commits]

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

I think this is basically LGTM from me. Lets make sure we wait until @jh7370 weighs in w/ a full review to land though.

https://github.com/llvm/llvm-project/pull/157499