Use the LookupIterator for SetElement and friends

src/runtime/runtime-literals.cc

Index: src/runtime/runtime-literals.cc
diff --git a/src/runtime/runtime-literals.cc b/src/runtime/runtime-literals.cc
index 522411829abe4fc7a0d556a96360a40ef14d8a13..52c1726dc65ea256c1fafeb5d7eea890cf1f161f 100644
--- a/src/runtime/runtime-literals.cc
+++ b/src/runtime/runtime-literals.cc
@@ -94,8 +94,8 @@ MUST_USE_RESULT static MaybeHandle<Object> CreateObjectLiteralBoilerplate(
       if (Handle<String>::cast(key)->AsArrayIndex(&element_index)) {
         // Array index as string (uint32).
         if (value->IsUninitialized()) value = handle(Smi::FromInt(0), isolate);
-        maybe_result =
-            JSObject::SetOwnElement(boilerplate, element_index, value, SLOPPY);
+        maybe_result = JSObject::SetOwnElementIgnoreAttributes(
+            boilerplate, element_index, value, NONE);
       } else {
         Handle<String> name(String::cast(*key));
         DCHECK(!name->AsArrayIndex(&element_index));
@@ -105,8 +105,8 @@ MUST_USE_RESULT static MaybeHandle<Object> CreateObjectLiteralBoilerplate(
     } else if (key->ToArrayIndex(&element_index)) {
       // Array index (uint32).
       if (value->IsUninitialized()) value = handle(Smi::FromInt(0), isolate);
-      maybe_result =
-          JSObject::SetOwnElement(boilerplate, element_index, value, SLOPPY);
+      maybe_result = JSObject::SetOwnElementIgnoreAttributes(
+          boilerplate, element_index, value, NONE);
     } else {
       // Non-uint32 number.
       DCHECK(key->IsNumber());