Oilpan: introduce eager finalization.

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 3b2c8d649be43b4dc04a4e88083f4b4c0947efe3..ed0d27e8c3f83732237a9ea7c552a553af81a60d 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -137,11 +137,11 @@ using EphemeronCallback = VisitorCallback;
 #define TypedHeapEnumName(Type) Type##HeapIndex,
 
 enum HeapIndices {
-    NormalPage1HeapIndex = 0,
+    EagerSweepHeapIndex = 0,
+    NormalPage1HeapIndex,
     NormalPage2HeapIndex,
     NormalPage3HeapIndex,
     NormalPage4HeapIndex,
-    EagerSweepHeapIndex,
     Vector1HeapIndex,
     Vector2HeapIndex,
     Vector3HeapIndex,
@@ -637,6 +637,11 @@ private:
 
     void eagerSweep();
 
+#if defined(ADDRESS_SANITIZER)
+    void poisonEagerHeaps(bool poisonOrNot);
+    void poisonHeapsForCompleteSweep();
+#endif
+
     // When ThreadState is detaching from non-main thread its
     // heap is expected to be empty (because it is going away).
     // Perform registered cleanup tasks and garbage collection