[VPlan] Fold (MUL A, 1) -> A as VPlan2VPlan transform.
Add first VPlan-based recipe simplification to fold (MUL A, 1) -> A. Among other things, this enables additional simplifications after applying versioned strides, as follow up to D147783. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D159200
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