[ARM] Pass half or i16 types for NEON intrinsics

[ARM] Pass half or i16 types for NEON intrinsics

For generating NEON intrinsics, this determines the NEON data type, and whether
it should be a half type or an i16 type. I.e., we always pass a half type for
AArch64, this hasn't changed, but now also for ARM but only when FullFP16 is
enabled, and i16 otherwise.

This is intended to be non-functional change, but together with the backend
work in D44538 which adds support for f16 vectors, this enables adding the
AArch32 FP16 (vector) intrinsics.

Differential Revision: https://reviews.llvm.org/D44561

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@327836 91177308-0d34-0410-b5e6-96231b3b80d8