Fix cluster-fuzz found regression with d8 Workers

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 2006 matching lines @@
     seen_objects->Add(array);
     out_data->WriteTag(kSerializationTagArray);
     uint32_t length = array->Length();
     out_data->Write(length);
     for (uint32_t i = 0; i < length; ++i) {
       Local<Value> element_value;
       if (array->Get(context, i).ToLocal(&element_value)) {
         if (!SerializeValue(isolate, element_value, to_transfer, seen_objects,
                             out_data))
           return false;
+      } else {
+        Throw(isolate, "Failed to serialize array element.");
+        return false;
       }
     }
   } else if (value->IsArrayBuffer()) {
     Handle<ArrayBuffer> array_buffer = Handle<ArrayBuffer>::Cast(value);
     if (FindInObjectList(array_buffer, *seen_objects)) {
       Throw(isolate, "Duplicated array buffers not supported");
       return false;
     }
     seen_objects->Add(array_buffer);
     if (FindInObjectList(array_buffer, to_transfer)) {
@@ skipping 54 matching lines @@
     for (uint32_t i = 0; i < length; ++i) {
       Handle<Value> name;
       Handle<Value> property_value;
       if (property_names->Get(context, i).ToLocal(&name) &&
           object->Get(context, name).ToLocal(&property_value)) {
         if (!SerializeValue(isolate, name, to_transfer, seen_objects, out_data))
           return false;
         if (!SerializeValue(isolate, property_value, to_transfer, seen_objects,
                             out_data))
           return false;
+      } else {
+        Throw(isolate, "Failed to serialize property.");
+        return false;
       }
     }
   } else {
     Throw(isolate, "Don't know how to serialize object");
     return false;
   }
 
   return true;
 }
 
@@ skipping 319 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif