Minor cleanup and optimisation of element methods.

src/elements.cc

Index: src/elements.cc
diff --git a/src/elements.cc b/src/elements.cc
index 89d3a7b93c85aa6a508bda421baca5fdccac7428..8cb48c6ad8a418e3640b82d2d796b191eddc9a7a 100644
--- a/src/elements.cc
+++ b/src/elements.cc
@@ -528,9 +528,8 @@ class ElementsAccessorBase : public ElementsAccessor {
                              JSObject* holder,
                              uint32_t key,
                              BackingStore* backing_store) {
-    MaybeObject* element =
-        ElementsAccessorSubclass::GetImpl(receiver, holder, key, backing_store);
-    return !element->IsTheHole();
+    return ElementsAccessorSubclass::GetAttributesImpl(
+        receiver, holder, key, backing_store) != ABSENT;
   }
 
   virtual bool HasElement(Object* receiver,