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

[James Henderson via llvm-commits]

jh7370 wrote:

> This needs motivation. I think Binutils maintainers will likely have a strong opinion about the name if they add a similar option. I suspect that `--ignore-symbol` may not be a name they like. If this option is indeed useful, you may file a feature request https://sourceware.org/bugzilla/enter_bug.cgi

Before reviewing this further, I'd like the motivation explained as per this comment.

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