[llvm] [ELF][Objcopy] Dont corrupt symbol table when `--update-section` is called for ELF files (PR #170462)

[James Henderson via llvm-commits]

jh7370 wrote:

> @jh7370 Could you please review this PR or assign appropriate people to it? I don't have enough permissions to assign reviewers myself.

I'll take a look at it. I'm probably the closest thing to a lead maintainer on the ELF side of llvm-objcopy that we have. @MaskRay may also wish to take a look.

https://github.com/llvm/llvm-project/pull/170462