Move hash code from hidden string to a private symbol

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2514 matching lines @@
   if (!key->IsJSReceiver() && !key->IsSymbol()) {
     DCHECK(false);
     return;
   }
   i::Handle<i::ObjectHashTable> table(
       i::ObjectHashTable::cast(weak_collection->table()));
   if (!table->IsKey(*key)) {
     DCHECK(false);
     return;
   }
-  i::Runtime::WeakCollectionSet(weak_collection, key, value);
+  int32_t hash = i::Object::GetOrCreateHash(isolate, key)->value();
+  i::Runtime::WeakCollectionSet(weak_collection, key, value, hash);
 }
 
 
 Local<Value> NativeWeakMap::Get(Handle<Value> v8_key) {
   i::Handle<i::JSWeakMap> weak_collection = Utils::OpenHandle(this);
   i::Isolate* isolate = weak_collection->GetIsolate();
   ENTER_V8(isolate);
   i::Handle<i::Object> key = Utils::OpenHandle(*v8_key);
   if (!key->IsJSReceiver() && !key->IsSymbol()) {
     DCHECK(false);
@@ skipping 5533 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal