Oilpan: Support polymorphic objects in HeapVectorBackings

Source/platform/heap/Heap.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 89 matching lines @@
 
 #if ENABLE(GC_PROFILING)
 static String classOf(const void* object)
 {
     if (const GCInfo* gcInfo = Heap::findGCInfo(reinterpret_cast<Address>(const_cast<void*>(object))))
         return gcInfo->m_className;
     return "unknown";
 }
 #endif
 
-static bool vTableInitialized(void* objectPointer)
-{
-    return !!(*reinterpret_cast<Address*>(objectPointer));
-}
-
 static size_t roundToOsPageSize(size_t size)
 {
     return (size + WTF::kSystemPageSize - 1) & ~(WTF::kSystemPageSize - 1);
 }
 
 class MemoryRegion {
 public:
     MemoryRegion(Address base, size_t size)
         : m_base(base)
         , m_size(size)
@@ skipping 2563 matching lines @@
 size_t Heap::s_allocatedObjectSize = 0;
 size_t Heap::s_allocatedSpace = 0;
 size_t Heap::s_markedObjectSize = 0;
 // We don't want to use 0 KB for the initial value because it may end up
 // triggering the first GC of some thread too prematurely.
 size_t Heap::s_estimatedLiveObjectSize = 512 * 1024;
 size_t Heap::s_externalObjectSizeAtLastGC = 0;
 double Heap::s_estimatedMarkingTimePerByte = 0.0;
 
 } // namespace blink