[lld] [ELF] Fix non-preemptible IFUNC IRELATIVE addends (PR #179037)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

Also, a couple of questions:

1. What is section 47 in those objects?
2. For the first one, what section and associated symbols do c62ac and c591a refer to?

https://github.com/llvm/llvm-project/pull/179037