[elements] Avoid using IsKey in loops

src/objects-inl.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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 2980 matching lines @@
 }
 
 
 // static
 int HashTableBase::ComputeCapacity(int at_least_space_for) {
   const int kMinCapacity = 4;
   int capacity = base::bits::RoundUpToPowerOfTwo32(at_least_space_for * 2);
   return Max(capacity, kMinCapacity);
 }
 
+bool HashTableBase::IsKey(Heap* heap, Object* k) {
+  return k != heap->the_hole_value() && k != heap->undefined_value();
+}
 
 bool HashTableBase::IsKey(Object* k) {
   return !k->IsTheHole() && !k->IsUndefined();
 }
 
 
 void HashTableBase::SetNumberOfElements(int nof) {
   set(kNumberOfElementsIndex, Smi::FromInt(nof));
 }
 
@@ skipping 4824 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_