[llvm] [objcopy] Return an error in case of an invalid regex (PR #74319)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> Nit: the commit/PR title's tag should be llvm-objcopy, not simply objcopy.

This comment was not resolved. The subject is "[objcopy] Return an error in case of an invalid regex #74319". Don't forget it for future contributions:)

https://github.com/llvm/llvm-project/pull/74319