[AArch64][GlobalISel] Add support for narrowScalar of G_ZEXT
We do this by merging the source with the high bits set to 0. Differential Revision: https://reviews.llvm.org/D66181 llvm-svn: 369480
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We do this by merging the source with the high bits set to 0. Differential Revision: https://reviews.llvm.org/D66181 llvm-svn: 369480