[AArch64] Armv8.4-A: Flag manipulation instructions

These instructions are added to AArch64 only.

Differential Revision: https://reviews.llvm.org/D48926


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336421 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed