[llvm] [llvm-objcopy] Add support of symbol modification flags for MachO (PR #120895)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Please update the docs (llvm/docs/CommandGuide/llvm-objcopy.rst) to move the relevant options from the ELF-specific section to the generic options section.

Am I right in thinking that this automatically supports the file-based inputs like `--globalize-symbols` too, because this bit is in the generic code? If so, please update the tests to cover them and the PR description to mention this.

https://github.com/llvm/llvm-project/pull/120895