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[ARM] Add a batch of similarly encoded MVE instructions.

Authored by simon_tatham on Jun 21 2019, 5:13 AM.

Description

[ARM] Add a batch of similarly encoded MVE instructions.

Summary:
This adds the MVE_qDest_qSrc superclass and all instructions that
inherit from it. It's not the complete class of _everything_ with a
q-register as both destination and source; it's a subset of them that
all have similar encodings (but it would have been hopelessly unwieldy
to call it anything like MVE_111x11100).

This category includes add/sub with carry; long multiplies; halving
multiplies; multiply and accumulate, and some more complex
instructions.

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

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62677

llvm-svn: 364037

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