[llvm] [llvm-readobj][offload] Fix llvm-readobj --all on MachO (PR #175912)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

I'm fine with this fix, but if people's would rather omit the offloading flag from this mode I'd be fine there as well.

https://github.com/llvm/llvm-project/pull/175912