[llvm] [DwarfGenerator] Calculate relative offset according to Dwarf Version (PR #84847)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

LGTM, not sure how this isn't already causing issues...!

> > Looks good. Can we add a unit test for this?

This is already code for generating test inputs and nothing else. What exactly would you test?

https://github.com/llvm/llvm-project/pull/84847