[llvm] [llvm-objcopy] Add change-section-lma *+/-offset (PR #95431)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Could you describe what the actual behaviour is when GNU objcopy uses this option, please?

Also, could you go into more detail about what your use-case is, please?

https://github.com/llvm/llvm-project/pull/95431