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[AArch64][GlobalISel] Implement selection for G_UNMERGE of vectors to vectors.

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

Description

[AArch64][GlobalISel] Implement selection for G_UNMERGE of vectors to vectors.

This re-uses the previous support for extract vector elt to extract the
subvectors.

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

llvm-svn: 356213