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[AArch64][GlobalISel] Implement narrowing of G_SEXT.

Authored by aemerson on Jul 26 2019, 4:46 PM.

Description

[AArch64][GlobalISel] Implement narrowing of G_SEXT.

We need this to narrow a sext to s128.

Differential Revision: https://reviews.llvm.org/D65357

llvm-svn: 367164