[lld] [WIP/RFC][ELF][PowerPC] Don't assume TOC pointer is valid in IPLT entries (PR #207555)

[Jessica Clarke via llvm-commits]

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jrtc27 wrote:

Oh, I see, this is how we do per-file .got2... yeah that's also dodgy for direct calls of non-preemptible IFUNCs, the file passed in is sym.file which isn't necessarily the same as the caller's

https://github.com/llvm/llvm-project/pull/207555