[ARM] Add a batch of MVE floating-point instructions.
Summary:
This includes floating-point basic arithmetic (add/sub/multiply),
complex add/multiply, unary negation and absolute value, rounding to
integer value, and conversion to/from integer formats.
Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover
Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62675
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364013
91177308-0d34-0410-b5e6-
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