[llvm] [llvm-objcopy] Fix file offsets when PT_INTERP/PT_LOAD offsets are equal (PR #80562)

[Steven Johnson via llvm-commits]

steven-johnson wrote:

Update: looks like `git bisect` was lying to me -- there is an injection point somewhere in LLVM for this crash, but this PR is definitely not the culprit. Sorry for the noise.

https://github.com/llvm/llvm-project/pull/80562