[ARM] FP16: support vector zip and unzip

This is addressing PR38404.

Differential Revision: https://reviews.llvm.org/D50186


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338835 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed