change vector range notation to a list of registers for clang compatibility. break compare into 2 neon files for consistency with other neon64 files.
BUG=357
TESTED=local ios build
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/30379004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1085 16f28f9a-4ce2-e073-06de-1de4eb20be90