[llvm] [Object] Beginnings of SFrame parser and dumper (PR #147294)

[Pavel Labath via llvm-commits]

labath wrote:

> Has GNU readelf's --all been updated to dump sframe too, since it does imply --unwind? If so, we should update to match.

No, judging by my experiments, `--all` does not imply `--sframe` (and neither does --unwind). @ibhagatgnu 

> 
> I'm not seeing the changes you said you made for things like `createError`? Did you push the wrong commit or something?

Yeah, I forgot to commit those changes. They're in now.

https://github.com/llvm/llvm-project/pull/147294