[VP] Canonicalize macros of VPIntrinsics.def

Usage and naming of macros in VPIntrinsics.def has been inconsistent. Rename all property macros to VP_PROPERTY_<name>.  Use BEGIN/END scope macros to attach properties to vp intrinsics and SDNodes (instead of specifying either directly with the property macro).
A follow-up patch has documentation on how the macros are (intended) to be used.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D114144