[lld] [ELF] -r --compress-debug-sections: update addends for .debug_* sections relocated by REL (PR #66804)

[Nick Desaulniers via llvm-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

Fixes builds with compressed debug info, but introduces warnings for builds without any debug info (compressed or not) for 32b x86.

https://github.com/llvm/llvm-project/pull/66804