Use the LookupIterator for SetElement and friends

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 06846ffb8f5c431c938beb5ced8bb0f2ad55d0b2..c9e4c0f21974a8983024e4bc0b4f1415cccc87e1 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -541,17 +541,19 @@ void ArrayLiteral::BuildConstantElements(Isolate* isolate) {
       }
     }
     Handle<Object> boilerplate_value = GetBoilerplateValue(element, isolate);
+
     if (boilerplate_value->IsTheHole()) {
       is_holey = true;
-    } else if (boilerplate_value->IsUninitialized()) {
+      continue;
+    }
+
+    if (boilerplate_value->IsUninitialized()) {
+      boilerplate_value = handle(Smi::FromInt(0), isolate);
       is_simple = false;
-      JSObject::SetOwnElement(array, array_index,
-                              handle(Smi::FromInt(0), isolate),
-                              SLOPPY).Assert();
-    } else {
-      JSObject::SetOwnElement(array, array_index, boilerplate_value, SLOPPY)
-          .Assert();
     }
+
+    JSObject::AddDataElement(array, array_index, boilerplate_value, NONE)
+        .Assert();
   }
 
   if (array_index != values()->length()) {