[llvm] [NFC][VPlan] Print element type for vector-pointer recipes (PR #212332)

[Andrei Elovikov via llvm-commits]

eas wrote:

Thanks @lukel97 , @artagnon for quick review. 

Yes, should have made it more gep-like from the start but somehow didn't think of it. Updated now. Also done the same for vector-end-pointer per Luke's suggestion.

https://github.com/llvm/llvm-project/pull/212332