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[VPlan] Add & use VPValue operands for VPWidenRecipe (NFC).

Authored by fhahn on Apr 23 2020, 3:55 AM.

Description

[VPlan] Add & use VPValue operands for VPWidenRecipe (NFC).

This patch adds VPValue version of the instruction operands to
VPWidenRecipe and uses them during code-generation.

Similar to D76373 this reduces ingredient def-use usage by ILV as
a step towards full VPlan-based def-use relations.

Reviewers: rengolin, Ayal, gilr

Reviewed By: gilr

Differential Revision: https://reviews.llvm.org/D76992