[llvm] LV: add crash-test for incomplete cases in VPlan (PR #93551)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

I didn't want to invalidate the test in infer-not-or-type.ll by adding a crash test, so I consolidate the files in the fix (#93553).

https://github.com/llvm/llvm-project/pull/93551