Oilpan: when snapshotting type-specific pages use GCInfo of the page.

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 1382 matching lines @@
     Header* header = 0;
     for (Address addr = payload(); addr < end(); addr += header->size()) {
         header = reinterpret_cast<Header*>(addr);
         if (json)
             json->pushInteger(header->encodedSize());
         if (header->isFree()) {
             info->freeSize += header->size();
             continue;
         }
 
-        size_t tag = info->getClassTag(header->gcInfo());
+        const GCInfo* gcinfo = header->gcInfo() ? header->gcInfo() : gcInfo();
+        size_t tag = info->getClassTag(gcinfo);
         size_t age = header->age();
         if (json)
             json->pushInteger(tag);
         if (header->isMarked()) {
             info->liveCount[tag] += 1;
             info->liveSize += header->size();
             // Count objects that are live when promoted to the final generation.
             if (age == maxHeapObjectAge - 1)
                 info->generations[tag][maxHeapObjectAge] += 1;
             header->incAge();
@@ skipping 969 matching lines @@
 Visitor* Heap::s_markingVisitor;
 CallbackStack* Heap::s_markingStack;
 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;
 }