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[ARM] Add MVE vector compare instructions.

Authored by simon_tatham on Jun 21 2019, 4:14 AM.

Description

[ARM] Add MVE vector compare instructions.

Summary:
These take a pair of vector register to compare, and a comparison type
(written in the form of an Arm condition suffix); they output a vector
of booleans in the VPR register, where predication can conveniently
use them.

Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62676

llvm-svn: 364027