[VPlan] Rename VPReverseVectorPointerRecipe to VPVectorEndPointerRecipe. NFC (#131086) After #128718 lands there will be two ways of performing a reversed widened memory access, either by performing a consecutive unit-stride access and a reverse, or a strided access with a negative stride. Even though both produce a reversed vector, only the former needs VPReverseVectorPointerRecipe which computes a pointer to the last element of each part. A strided reverse still needs a pointer to the first element of each part so it will use VPVectorPointerRecipe. This renames VPReverseVectorPointerRecipe to VPVectorEndPointerRecipe to clarify that a reversed access may not necessarily need a pointer to the last element.
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