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

[Ilia Kuklin via llvm-commits]

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kuilpd wrote:

I didn't quite understand, should I merge all 4 tests into one file or just set-visibility-symbol.test and set-visibility-symbols.test?

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