[lld] [NFC][ELF] Only create alias in handleNonPreemptibleIfunc if needed (PR #210613)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

> > Then this PR and "[NFC][ELF] Create fresh alias in handleNonPreemptibleIfunc" should just be merged into one?
> 
> I mean, I can if you'd like, but I felt this made each incremental step easy to review for correctness (both for PRs and for people looking back at the history), even if you need to look at more than one commit for the bigger picture.

What if I instead added to the commit message, stating that a future commit will rely on this only being done for the direct reloc case?

https://github.com/llvm/llvm-project/pull/210613