bac427a0f6
These VPlan debug output tests were added in https://github.com/llvm/llvm-project/pull/108351 and https://github.com/llvm/llvm-project/pull/110412, whenever we used to convert regular widening recipes to VP intrinsics during EVL tail folding. Nowadays we don't convert these recipes so there's nothing really to be gained from testing them. This removes the VPlan tests since an upcoming patch slightly perturbs these VPlans and removing them seems easier than manually going through and updating them all. I've kept behind the LLVM IR/UTC counterparts in `tail-folding-{cast,call}-intrinsics.ll`, since even though they also aren't really testing anything useful at least they're easy to update.
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