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[ARM][MVE] Add VHADD and VHSUB patterns

Authored by samparker on Apr 15 2020, 1:57 AM.

Description

[ARM][MVE] Add VHADD and VHSUB patterns

Add patterns that use a normal, non-wrapping, add and sub nodes along
with an arm vshr imm node.

Differential Revision: https://reviews.llvm.org/D77065

Details