[llvm-branch-commits] ELF: Do not rewrite IFUNC relocations to point to PLT if no GOT/PLT needed. (PR #133531)

[Peter Collingbourne via llvm-branch-commits]

https://github.com/pcc created https://github.com/llvm/llvm-project/pull/133531

This enables the use of IFUNC to implement custom relocation types,
such as the PAuth relocation types that will be introduced in a
subsequent pull request.

TODO:
- Add tests.
- Fix broken tests.