ccf788a565
Since SCEV learned to look through single value phis with 20d798bd47ec5191de1b2a8a031da06a04e612e1, whenever we add a new input to a Phi, we should make sure that the old cached value is dropped. Otherwise, it may lead to various miscompiles, such as breach of dominance as shown in the bug https://github.com/llvm/llvm-project/issues/57335