dom-query.html spends ~10% of total time in OSAtomicAdd32Barrier on my Mac

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 17351755714cb80ed076b491010f09b6793ee1e3..33afc3f804433bad658b19fca48037d3d2714fd9 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -708,7 +708,8 @@ MaybeObject* Object::GetElementWithReceiver(Object* receiver, uint32_t index) {
     }
 
     if (js_object->HasIndexedInterceptor()) {
-      return js_object->GetElementWithInterceptor(receiver, index);
+      return js_object->GetElementWithInterceptor(
+          receiver, index, heap->isolate());
     }
 
     if (js_object->elements() != heap->empty_fixed_array()) {
@@ -10179,8 +10180,8 @@ MaybeObject* JSArray::JSArrayUpdateLengthFromIndex(uint32_t index,
 
 
 MaybeObject* JSObject::GetElementWithInterceptor(Object* receiver,
-                                                 uint32_t index) {
-  Isolate* isolate = GetIsolate();
+                                                 uint32_t index,
+                                                 Isolate* isolate) {
   // Make sure that the top context does not change when doing
   // callbacks or interceptor calls.
   AssertNoContextChange ncc;