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[GISel][CombinerHelper] Add a combine turning shuffle_vector into concat_vectors

Authored by qcolombet on Mon, Oct 21, 1:39 PM.

Description

[GISel][CombinerHelper] Add a combine turning shuffle_vector into concat_vectors

Teach the CombinerHelper how to turn shuffle_vectors, that
concatenate vectors, into concat_vectors and add this combine
to the AArch64 pre-legalizer combiner.

Differential Revision: https://reviews.llvm.org/D69149

llvm-svn: 375452