[llvm] [llvm-objcopy] Add llvm-objcopy option --set-symbol-visibility (PR #80872)

[James Henderson via llvm-commits]

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jh7370 wrote:

`globalize.test` tests both the `globalize-symbol` and `globalize-symbols` option, so I think they probably want to be in the same file. It's not necessarily clear-cut, but is probably a good idea.

https://github.com/llvm/llvm-project/pull/80872