[llvm] [LV] Add target-independent tests for type-mismatch (PR #130295)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

> , and demonstrate that LoopVectorize only ever interleaves when types mismatch.

I think I am missing how type mismatch is related to interleaving? Picking the interleave count should be independent of whether access types mismatch I think?

https://github.com/llvm/llvm-project/pull/130295