Do not fire timers for finalizing objects.

Source/platform/heap/ThreadState.h

Index: Source/platform/heap/ThreadState.h
diff --git a/Source/platform/heap/ThreadState.h b/Source/platform/heap/ThreadState.h
index 6f788b740f11bd48b416b604c8e468582770a94a..75db15418a6cf7fb593ffadcd8c9226082891ef0 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -260,6 +260,8 @@ public:
     static void shutdownHeapIfNecessary();
     bool isTerminating() { return m_isTerminating; }
 
+    bool lazySweepToken() { return m_lazySweepToggle; }
+
     static void attachMainThread();
     static void detachMainThread();
 
@@ -640,6 +642,13 @@ private:
     Vector<OwnPtr<CleanupTask>> m_cleanupTasks;
     bool m_isTerminating;
 
+    // Lazy sweeping will mark pages as having been swept as the
+    // operation progresses. This is done by encoding the current
+    // lazy sweep state of their ThreadState on the page. Just a
+    // single bit is required, which is toggled when a new sweep
+    // is initiated.
+    bool m_lazySweepToggle;
+
     bool m_shouldFlushHeapDoesNotContainCache;
     double m_collectionRate;
     GCState m_gcState;