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

[Ilia Kuklin via llvm-commits]

kuilpd 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.

This option is needed mostly to support cases where there is a need to change parameters of a vast number of symbols with exception of a few specific symbols. Writing a negative pattern is much simpler than many positive patterns that avoid a certain case. Plus, since there is an option --keep-symbol that does exactly this but for removing symbols, there should also be one that keeps symbols' parameters from being changed.


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