[lld] [llvm] [IPSCCP] Track returns of non-interposable definitions (PR #210374)

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michaelselehov wrote:

> I don't think this is correct. If the return value is non-deterministic, we may refine to a specific value, which IPSCCP will propagate after this change. However, the prevailing definition may end up doing a different non-deterministic choice.

@nikic you're right. I don't see a good way to fix this problem in this patch. Closing the PR. I'll think of a different solution.

https://github.com/llvm/llvm-project/pull/210374