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[ARM][MVE] Refactor complex vector intrinsics [NFCI]

Authored by miyuki on Dec 10 2019, 8:21 AM.

Description

[ARM][MVE] Refactor complex vector intrinsics [NFCI]

Summary:
This patch refactors instruction selection of the complex vector
addition, multiplication and multiply-add intrinsics, so that it is
now based on TableGen patterns rather than C++ code.

It also changes the first parameter (halving vs non-halving) of the
arm_mve_vcaddq IR intrinsic to match the corresponding instruction
encoding, hence it requires some changes in the tests.

The patch addresses David's comment in https://reviews.llvm.org/D71190

Reviewers: dmgreen, ostannard, simon_tatham, MarkMurrayARM

Reviewed By: dmgreen

Subscribers: merge_guards_bot, kristof.beyls, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D71245