Disabled block linking in this mode, can re-enable with some more work later.
To enable W^X on other platforms than iOS, simply change PlatformIsWXExclusive.
Opens up for having multiple JIT implementations available at runtime,
which could be use for experimenting with new JIT compiler types or for
unit testing one JIT on another architecture.
Very few of the newly virtual calls are on any sort of critical path so
hopefully there will not be a performance loss.
Florent Castelli