[llvm] [llvm-objcopy] Add llvm-objcopy option --ignore-symbol (PR #80873)

[Fangrui Song via llvm-commits]

MaskRay wrote:

This needs motivation. I think Binutils maintainers will likely have a strong opinion about the name if they add a similar option. If this is indeed useful, you may file a feature request https://sourceware.org/bugzilla/enter_bug.cgi 

https://github.com/llvm/llvm-project/pull/80873