Make the GC aware of JSReceiver pointers in LookupResults.

src/profile-generator.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2148 matching lines @@
   int length = js_obj->GetInternalFieldCount();
   for (int i = 0; i < length; ++i) {
     Object* o = js_obj->GetInternalField(i);
     SetInternalReference(
         js_obj, entry, i, o, js_obj->GetInternalFieldOffset(i));
   }
 }
 
 
 String* V8HeapExplorer::GetConstructorName(JSObject* object) {
-  if (object->IsJSFunction()) return HEAP->closure_symbol();
+  Heap* heap = object->GetHeap();
+  if (object->IsJSFunction()) return heap->closure_symbol();
   String* constructor_name = object->constructor_name();
-  if (constructor_name == HEAP->Object_symbol()) {
+  if (constructor_name == heap->Object_symbol()) {
     // Look up an immediate "constructor" property, if it is a function,
     // return its name. This is for instances of binding objects, which
     // have prototype constructor type "Object".
     Object* constructor_prop = NULL;
-    LookupResult result;
-    object->LocalLookupRealNamedProperty(HEAP->constructor_symbol(), &result);
+    LookupResult result(heap->isolate());
+    object->LocalLookupRealNamedProperty(heap->constructor_symbol(), &result);
     if (result.IsProperty()) {
       constructor_prop = result.GetLazyValue();
     }
     if (constructor_prop->IsJSFunction()) {
       Object* maybe_name = JSFunction::cast(constructor_prop)->shared()->name();
       if (maybe_name->IsString()) {
         String* name = String::cast(maybe_name);
         if (name->length() > 0) return name;
       }
     }
@@ skipping 1207 matching lines @@
 
 
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))
     sorted_entries->Add(p);
   sorted_entries->Sort(SortUsingEntryValue);
 }
 
 } }  // namespace v8::internal