[AArch64] Add subtarget features for ARMv8.2-A

[AArch64] Add subtarget features for ARMv8.2-A

This adds subtarget features for ARMv8.2-A, which builds on (and
requires the features from) ARMv8.1-A. Most assembler-visible features
of ARMv8.2-A are system instructions, and are all required parts of the
architecture, so just depend on the HasV8_2aOps subtarget feature. There
is also one large, optional feature, which adds 16-bit floating point
versions of all existing floating-point instructions (VFP and SIMD),
this is represented by the FeatureFullFP16 subtarget feature.

Differential Revision: http://reviews.llvm.org/D15013

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254154 91177308-0d34-0410-b5e6-96231b3b80d8