Oilpan: add assert to verify eager finalization.

Source/platform/heap/Heap.cpp

Index: Source/platform/heap/Heap.cpp
diff --git a/Source/platform/heap/Heap.cpp b/Source/platform/heap/Heap.cpp
index d4ab0e40432e6cf8f45c5157c92622073e1e2fce..147a16564449735ae58332ab87bca341032eb812 100644
--- a/Source/platform/heap/Heap.cpp
+++ b/Source/platform/heap/Heap.cpp
@@ -456,9 +456,18 @@ void BaseHeap::completeSweep()
     ASSERT(threadState()->sweepForbidden());
     ASSERT(!threadState()->isMainThread() || ScriptForbiddenScope::isScriptForbidden());
 
-    while (m_firstUnsweptPage) {
+#if ENABLE(ASSERT)
+    if (heapIndex() == EagerSweepHeapIndex)
+        threadState()->enterEagerSweepScope();
+#endif
+
+    while (m_firstUnsweptPage)
         sweepUnsweptPage();
-    }
+
+#if ENABLE(ASSERT)
+    if (heapIndex() == EagerSweepHeapIndex)
+        threadState()->leaveEagerSweepScope();
+#endif
 }
 
 NormalPageHeap::NormalPageHeap(ThreadState* state, int index)