Fix object sealing with spidermonkey 1.7.0
Fix object sealing with spidermonkey 1.7.0

cloudant/bigcouch,kofron/bigcouch,cloudant/bigcouch,andrejb/cloudant_bigcouch,cloudant/bigcouch,Asquera/bigcouch,breezjw/bigcouch,cloudant/bigcouch,kofron/bigcouch,georgemarshall/bigcouch,kofron/bigcouch,linearregression/bigcouch,andrejb/cloudant_bigcouch,PerilousApricot/bigcouch,linearregression/bigcouch,Asquera/bigcouch,PerilousApricot/bigcouch,linearregression/bigcouch,cloudant/bigcouch,Asquera/bigcouch,PerilousApricot/bigcouch,PerilousApricot/bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,andrejb/cloudant_bigcouch,linearregression/bigcouch,Asquera/bigcouch,PerilousApricot/bigcouch,breezjw/bigcouch,breezjw/bigcouch,linearregression/bigcouch,breezjw/bigcouch,kofron/bigcouch,breezjw/bigcouch,georgemarshall/bigcouch,kofron/bigcouch,georgemarshall/bigcouch,linearregression/bigcouch,PerilousApricot/bigcouch,georgemarshall/bigcouch,georgemarshall/bigcouch,cloudant/bigcouch,breezjw/bigcouch,georgemarshall/bigcouch,cloudant/bigcouch,Asquera/bigcouch,andrejb/cloudant_bigcouch,andrejb/cloudant_bigcouch,andrejb/cloudant_bigcouch,Asquera/bigcouch,linearregression/bigcouch