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[NEON] Define fp16 vld and vst intrinsics conditionally

Authored by ivan-labs on Aug 19 2018, 9:30 AM.

Description

[NEON] Define fp16 vld and vst intrinsics conditionally

This patch fixes definitions of vld and vst NEON intrinsics so
that we only define them if half-precision arithmetic is
supported on the target platform, as prescribed in ACLE 2.0.

Differential Revision: https://reviews.llvm.org/D49075

llvm-svn: 340140