[llvm] [VPlan] Format some print forms.NFC (PR #144644)

[via llvm-commits]

LiqinWeng wrote:

> Looks like a test wasn't updated, should be fixed in [ecff028](https://github.com/llvm/llvm-project/commit/ecff028a96626357d17d4e4fdce824a7da89ec1c)

Thansk so much !!!!!!

https://github.com/llvm/llvm-project/pull/144644