[ARM] Add v8.1a "Rounding Double Multiply Add/Subtract" extension

Reviewers: t.p.northover

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8503


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233301 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed