[VPlan] Move recipe based VPlan generation to separate function.

This first step separates VPInstruction-based and VPRecipe-based
VPlan creation, which should make it easier to migrate to VPInstruction
based code-gen step by step.

Reviewers: Ayal, rengolin, dcaballe, hsaito, mkuper, mzolotukhin

Reviewed By: dcaballe

Subscribers: bollu, tschuett, rkruppe, llvm-commits

Differential Revision: https://reviews.llvm.org/D47477


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334284 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed