zone             1741 src/hydrogen.cc Zone* zone() const { return graph_->zone(); }
zone             2293 src/hydrogen.cc Zone* zone() const { return graph_->zone(); }
zone              965 src/jsregexp.cc Zone* zone() const { return zone_; }
zone             1098 src/parser.cc  Zone* zone() const { return zone_; }
zone             2602 src/runtime.cc Zone* zone() const { return zone_; }