Move hash code from hidden string to a private symbol

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 797f3d0793d5d32e58d75fbe1c852bdac8e3b5be..b8d03074c65e2e720185c1bc0c16b4e91b265fce 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -100,10 +100,10 @@ namespace internal {
   F(GetWeakMapEntries, 2, 1)              \
   F(MapIteratorNext, 2, 1)                \
   F(WeakCollectionInitialize, 1, 1)       \
-  F(WeakCollectionGet, 2, 1)              \
-  F(WeakCollectionHas, 2, 1)              \
-  F(WeakCollectionDelete, 2, 1)           \
-  F(WeakCollectionSet, 3, 1)              \
+  F(WeakCollectionGet, 3, 1)              \
+  F(WeakCollectionHas, 3, 1)              \
+  F(WeakCollectionDelete, 3, 1)           \
+  F(WeakCollectionSet, 4, 1)              \
   F(GetWeakSetValues, 2, 1)               \
   F(ObservationWeakMapCreate, 0, 1)
 
@@ -855,9 +855,12 @@ class Runtime : public AllStatic {
   static void WeakCollectionInitialize(
       Isolate* isolate, Handle<JSWeakCollection> weak_collection);
   static void WeakCollectionSet(Handle<JSWeakCollection> weak_collection,
-                                Handle<Object> key, Handle<Object> value);
+                                Handle<Object> key, Handle<Object> value,
+                                int32_t hash);
   static bool WeakCollectionDelete(Handle<JSWeakCollection> weak_collection,
                                    Handle<Object> key);
+  static bool WeakCollectionDelete(Handle<JSWeakCollection> weak_collection,
+                                   Handle<Object> key, int32_t hash);
 
   static MaybeHandle<JSArray> GetInternalProperties(Isolate* isolate,
                                                     Handle<Object>);