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[DAGCombiner] Peek through vector concats when trying to combine shuffles.

Authored by Amaury Séchet <deadalnix@gmail.com> on Nov 22 2019, 2:39 PM.

Description

[DAGCombiner] Peek through vector concats when trying to combine shuffles.

Summary: This combine showed up as needed when exploring the regression when processing the DAG in topological order.

Reviewers: craig.topper, efriedma, RKSimon, lebedev.ri

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68195