[AArch64] Add ARMv8.2-A persistent memory instruction

[AArch64] Add ARMv8.2-A persistent memory instruction

ARMv8.2-A adds the "dc cvap" instruction, which is a system instruction
that cleans caches to the point of persistence (for systems that have
persistent memory). It is a required part of ARMv8.2-A, so no additional
subtarget features are required.

Differential Revision: http://reviews.llvm.org/D15016

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254156 91177308-0d34-0410-b5e6-96231b3b80d8