[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 Hi, gentle ping.
> 
> or may be @MaskRay can take a look.

Just taking a look again now: today is my first day back at work since before Christmas and I've got a lot of catching up to do.

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