[llvm-objcopy][NFC] Refactor symbol/section matching
The matchers for section/symbol related flags (e.g. --keep-symbol=Name or --regex --keep-symbol=foo.*) are currently just vectors that are matched linearlly. However, adding wildcard support would require negative matching too, e.g. a symbol should be removed if it matches a wildcard *but* doesn't match some other wildcard.
To make the next patch simpler, consolidate matching logic to a class defined in CopyConfig that takes care of matching.
Reviewers: jhenderson, seiya, MaskRay, espindola, alexshap
Reviewed By: jhenderson, MaskRay
Subscribers: emaste, arichardson, jakehehrlich, abrachet, llvm-commits
Differential Revision: https://reviews.llvm.org/D66432