Implement Harmony sets and maps.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 156376261af93440deb6596cd5d6710aeac618dc..64bda9473f6ca4d98232046094c5faf560d0f97e 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -156,6 +156,12 @@ void HeapObject::HeapObjectVerify() {
     case JS_ARRAY_TYPE:
       JSArray::cast(this)->JSArrayVerify();
       break;
+    case JS_SET_TYPE:
+      JSSet::cast(this)->JSSetVerify();
+      break;
+    case JS_MAP_TYPE:
+      JSMap::cast(this)->JSMapVerify();
+      break;
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapVerify();
       break;
@@ -500,6 +506,22 @@ void JSArray::JSArrayVerify() {
 }
 
 
+void JSSet::JSSetVerify() {
+  CHECK(IsJSSet());
+  JSObjectVerify();
+  VerifyHeapPointer(table());
+  ASSERT(table()->IsHashTable() || table()->IsUndefined());
+}
+
+
+void JSMap::JSMapVerify() {
+  CHECK(IsJSMap());
+  JSObjectVerify();
+  VerifyHeapPointer(table());
+  ASSERT(table()->IsHashTable() || table()->IsUndefined());
+}
+
+
 void JSWeakMap::JSWeakMapVerify() {
   CHECK(IsJSWeakMap());
   JSObjectVerify();