HeapProfiler: Make strings unique in HeapProfile.

src/heap-snapshot-generator.cc

 // Copyright 2013 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 2454 matching lines @@
   SerializeStrings();
   if (writer_->aborted()) return;
   writer_->AddCharacter(']');
   writer_->AddCharacter('}');
   writer_->Finalize();
 }
 
 
 int HeapSnapshotJSONSerializer::GetStringId(const char* s) {
   HashMap::Entry* cache_entry = strings_.Lookup(
-      const_cast<char*>(s), ObjectHash(s), true);
+      const_cast<char*>(s), StringHash(s), true);
   if (cache_entry->value == NULL) {
     cache_entry->value = reinterpret_cast<void*>(next_string_id_++);
   }
   return static_cast<int>(reinterpret_cast<intptr_t>(cache_entry->value));
 }
 
 
 static int utoa(unsigned value, const Vector<char>& buffer, int buffer_pos) {
   int number_of_digits = 0;
   unsigned t = value;
@@ skipping 234 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