Move hash code from hidden string to a private symbol

test/cctest/test-weaksets.cc

Index: test/cctest/test-weaksets.cc
diff --git a/test/cctest/test-weaksets.cc b/test/cctest/test-weaksets.cc
index dbb7311e83619f3770fdb0fc2f2ff3dd7e38b5dc..8ed1812437293a7dd95f2a435210cf9971068a23 100644
--- a/test/cctest/test-weaksets.cc
+++ b/test/cctest/test-weaksets.cc
@@ -90,7 +90,8 @@ TEST(WeakSet_Weakness) {
   {
     HandleScope scope(isolate);
     Handle<Smi> smi(Smi::FromInt(23), isolate);
-    Runtime::WeakCollectionSet(weakset, key, smi);
+    int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
+    Runtime::WeakCollectionSet(weakset, key, smi, hash);
   }
   CHECK_EQ(1, ObjectHashTable::cast(weakset->table())->NumberOfElements());
 
@@ -145,7 +146,8 @@ TEST(WeakSet_Shrinking) {
     for (int i = 0; i < 32; i++) {
       Handle<JSObject> object = factory->NewJSObjectFromMap(map);
       Handle<Smi> smi(Smi::FromInt(i), isolate);
-      Runtime::WeakCollectionSet(weakset, object, smi);
+      int32_t hash = Object::GetOrCreateHash(isolate, object)->value();
+      Runtime::WeakCollectionSet(weakset, object, smi, hash);
     }
   }
 
@@ -193,7 +195,8 @@ TEST(WeakSet_Regress2060a) {
       Handle<JSObject> object = factory->NewJSObject(function, TENURED);
       CHECK(!heap->InNewSpace(object->address()));
       CHECK(!first_page->Contains(object->address()));
-      Runtime::WeakCollectionSet(weakset, key, object);
+      int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
+      Runtime::WeakCollectionSet(weakset, key, object, hash);
     }
   }
 
@@ -235,7 +238,8 @@ TEST(WeakSet_Regress2060b) {
   Handle<JSWeakSet> weakset = AllocateJSWeakSet(isolate);
   for (int i = 0; i < 32; i++) {
     Handle<Smi> smi(Smi::FromInt(i), isolate);
-    Runtime::WeakCollectionSet(weakset, keys[i], smi);
+    int32_t hash = Object::GetOrCreateHash(isolate, keys[i])->value();
+    Runtime::WeakCollectionSet(weakset, keys[i], smi, hash);
   }
 
   // Force compacting garbage collection. The subsequent collections are used