[llvm] [LAA] Use SCEVPtrToAddr in tryToCreateDiffChecks. (PR #178861)

[Florian Hahn via llvm-commits]

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fhahn wrote:

This is because previously we did not create SCEVPtrToIntExprs for non-integral pointers but SCEVCouldNot Compute. Now we create PtrToAddr to compute the pointer difference, and use the lightweigth check variant. I think that should be fine, unless I am missing some constraint about  `ptrtoaddr` interacting with  non-integral pointers

https://github.com/llvm/llvm-project/pull/178861