Use the LookupIterator for SetElement and friends

src/runtime/runtime.h

 // 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 416 matching lines @@
   F(IsExtensible, 1, 1)                              \
   F(DisableAccessChecks, 1, 1)                       \
   F(EnableAccessChecks, 1, 1)                        \
   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
   F(ObjectFreeze, 1, 1)                              \
   F(ObjectSeal, 1, 1)                                \
   F(GetProperty, 2, 1)                               \
   F(KeyedGetProperty, 2, 1)                          \
   F(AddNamedProperty, 4, 1)                          \
   F(SetProperty, 4, 1)                               \
-  F(AddElement, 4, 1)                                \
+  F(AddElement, 3, 1)                                \
   F(AppendElement, 2, 1)                             \
   F(DeleteProperty, 3, 1)                            \
   F(HasOwnProperty, 2, 1)                            \
   F(HasProperty, 2, 1)                               \
   F(HasElement, 2, 1)                                \
   F(IsPropertyEnumerable, 2, 1)                      \
   F(GetPropertyNames, 1, 1)                          \
   F(GetPropertyNamesFast, 1, 1)                      \
   F(GetOwnPropertyNames, 2, 1)                       \
   F(GetOwnElementNames, 1, 1)                        \
@@ skipping 481 matching lines @@
 inline bool Runtime::AtomicIsLockFree(uint32_t size) {
   return size == 1 || size == 2 || size == 4;
 }
 
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_