SnapshotPositionEvent  242 src/log.h        void SnapshotPositionEvent(Address addr, int pos);
SnapshotPositionEvent  741 src/serialize.cc     LOG(isolate_, SnapshotPositionEvent(address, source_->position()));
SnapshotPositionEvent 1419 src/serialize.cc       SnapshotPositionEvent(object_->address(), sink_->Position()));