[llvm] [JITLink] Allow multiple relocations at same offset in EHFrameEdgeFixer (PR #68252)

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lhames wrote:

> And I personally don't like committing "temporary fixes" aka hacks.

If, as I suspect, we're going to enforce the single edge invariant in the future then this is also a temporary fix, though I'll grant you it's less of a hack. ;)

Are you happy to land this as a temporary fix for now on the understanding that it may need to be reverted, and the solution redesigned, once we come up with a long term design for LinkGraph edges?

https://github.com/llvm/llvm-project/pull/68252