[llvm] [SCEV] Add SCEVs for scopes as users of origin SCEV. (PR #119897)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Based on your description, I feel like this is something that forgetLcssaPhiWithNewPredecessor() on modified LCSSA phi nodes should be handling -- why doesn't it? Is there a call missing somewhere or does it not do what is necessary here?

https://github.com/llvm/llvm-project/pull/119897