[lld] [PAC][lld] Properly handle `.relr.auth.dyn` -> `.rela.dyn` movement (PR #195649)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

Addressed @MaskRay 's comments; when deleting redundant links - ensures that all sub-tests already contain explanation on what's tested

@jrtc27 I would appreciate your feedback on this - it looks like that other reviewers' concerns should be resolved at this point

https://github.com/llvm/llvm-project/pull/195649