[libunwind] [libunwind][PAC] Resign explicitly in loadAndAuthenticateLinkRegister (PR #183603)

[Daniil Kovalev via cfe-commits]

https://github.com/kovdan01 approved this pull request.

LGTM if @ojhunt has no objections on this, thanks!

I suppose that you've already ensured that runtime tests pass locally, but just in case if not, it might be worth triggering https://lab.llvm.org/staging/#/builders/228 buildbot (as soon as its configuration is updated and it becomes green for mainline :) ). Totally not necessary if you are sure that things would not become broken (the change is pretty straightforward indeed)

https://github.com/llvm/llvm-project/pull/183603