[ARM] Add ARMv8.2-A FP16 vector instructions

[ARM] Add ARMv8.2-A FP16 vector instructions

ARMv8.2-A adds 16-bit floating point versions of all existing SIMD
floating-point instructions. This is an optional extension, so all of
these instructions require the FeatureFullFP16 subtarget feature.

Note that VFP without SIMD is not a valid combination for any version of
ARMv8-A, but I have ensured that these instructions all depend on both
FeatureNEON and FeatureFullFP16 for consistency.

Differential Revision: http://reviews.llvm.org/D15039

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255764 91177308-0d34-0410-b5e6-96231b3b80d8