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[AArch64][GlobalISel] Add some support for G_CONCAT_VECTORS.

Authored by aemerson on Mar 14 2019, 3:48 PM.

Description

[AArch64][GlobalISel] Add some support for G_CONCAT_VECTORS.

Handles concatenating 2 x v2s32 and 2 x v4s16

Differential Revision: https://reviews.llvm.org/D59390

llvm-svn: 356212