Compute custom_instance_class before anything else
Compute custom_instance_class before anything else

The rest of class initialisation depends on it.

hippyvm/hippyvm,hippyvm/hippyvm,xhava/hippyvm,hippyvm/hippyvm,hippyvm/hippyvm,xhava/hippyvm,xhava/hippyvm,xhava/hippyvm,hippyvm/hippyvm,hippyvm/hippyvm,hippyvm/hippyvm,xhava/hippyvm,xhava/hippyvm,xhava/hippyvm