[llvm] [SCCP] Consider provenance when propagating constant ptrs (PR #160083)

[Nikita Popov via llvm-commits]

nikic wrote:

I think the only fully correct way to handle this is to encode this in the ValueLatticeElement directly. Otherwise it's not really possible to distinguish situations like a constant being propagated through a predicate (rather than derived from the predicate).

https://github.com/llvm/llvm-project/pull/160083