[VPlan] Use defined and ops VPValues to print VPInterleaveRecipe.

This patch updates VPInterleaveRecipe::print to print the actual defined
VPValues for load groups and the store VPValue operands for store
groups.

The IR references may become outdated while transforming the VPlan and
the defined and stored VPValues always are up-to-date.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D107223