Oilpan: Adjust m_biggestFreeListIndex in ThreadHeap<Header>::merge().

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 2749 matching lines @@
         splitOff->m_firstPage = 0;
         // Merge free lists.
         for (size_t i = 0; i < blinkPageSizeLog2; i++) {
             if (!m_freeList.m_freeLists[i]) {
                 m_freeList.m_freeLists[i] = splitOff->m_freeList.m_freeLists[i];
             } else if (splitOff->m_freeList.m_freeLists[i]) {
                 m_freeList.m_lastFreeListEntries[i]->append(splitOff->m_freeList.m_freeLists[i]);
                 m_freeList.m_lastFreeListEntries[i] = splitOff->m_freeList.m_lastFreeListEntries[i];
             }
         }
+        if (m_freeList.m_biggestFreeListIndex < splitOff->m_freeList.m_biggestFreeListIndex)
+            m_freeList.m_biggestFreeListIndex = splitOff->m_freeList.m_biggestFreeListIndex;
     }
 }
 
 void Heap::getHeapSpaceSize(uint64_t* objectSpaceSize, uint64_t* allocatedSpaceSize)
 {
     *objectSpaceSize = 0;
     *allocatedSpaceSize = 0;
     ASSERT(ThreadState::isAnyThreadInGC());
     ThreadState::AttachedThreadStateSet& threads = ThreadState::attachedThreads();
     typedef ThreadState::AttachedThreadStateSet::iterator ThreadStateIterator;
@@ skipping 181 matching lines @@
 CallbackStack* Heap::s_weakCallbackStack;
 CallbackStack* Heap::s_ephemeronStack;
 HeapDoesNotContainCache* Heap::s_heapDoesNotContainCache;
 bool Heap::s_shutdownCalled = false;
 bool Heap::s_lastGCWasConservative = false;
 FreePagePool* Heap::s_freePagePool;
 OrphanedPagePool* Heap::s_orphanedPagePool;
 Heap::RegionTree* Heap::s_regionTree = 0;
 
 } // namespace blink