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

[Pavel Labath via llvm-commits]

https://github.com/labath commented:

Thanks for the review. I'm going to do a rebase force-push now that the dependent PR has been merged. I apologise if that loses some the comments. I believe I have addressed all of them. I'll do subsequent updates via merges.

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