[ARM] Select MVE add and sub
This adds the first few patterns for MVE code generation, adding simple integer
add and sub patterns.
Initial code by David Sherwood
Differential Revision: https://reviews.llvm.org/D63255
llvm-svn: 364627
[ARM] Select MVE add and sub dmgreen on Jun 28 2019, 12:21 AM. Authored by Tags None Subscribers None
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