[llvm] [IVDescriptors] Check for null SE before dereference in getMinMaxRecurrence. (PR #195798)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

> Some callers don't pass SCEV.

Are there in-tree callers that don't pass it? If so, could you add an end-to-end test?

https://github.com/llvm/llvm-project/pull/195798