[clang] [flang] [flang][nfc] Refactor linker invocation logic (PR #75534)

[Michael Klemm via cfe-commits]

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

LGTM!

Thanks for the refactoring.  This makes the code much easier to digest!

https://github.com/llvm/llvm-project/pull/75534