[lld] [ELF] --pack-dyn-relocs=android+relr: place IRELATIVE in .rela.plt (PR #86751)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> LGTM. I verified that this patch fixes the test failures that I was seeing.

Thanks for testing. I land this tomorrow if I haven't heard of objections.

https://github.com/llvm/llvm-project/pull/86751