[elements] Precisely estimate elements size for large-object limits

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 2339 matching lines @@
   if (obj->IsUndefined(isolate)) return MaybeHandle<T>();
   return Handle<T>(T::cast(obj), isolate);
 }
 
 template <class T>
 Handle<T> FixedArray::GetValueChecked(Isolate* isolate, int index) const {
   Object* obj = get(index);
   CHECK(!obj->IsUndefined(isolate));
   return Handle<T>(T::cast(obj), isolate);
 }
-
-bool FixedArray::is_the_hole(int index) {
-  return get(index) == GetHeap()->the_hole_value();
+bool FixedArray::is_the_hole(Isolate* isolate, int index) {
+  return get(index)->IsTheHole(isolate);
 }
 
 void FixedArray::set(int index, Smi* value) {
   DCHECK(map() != GetHeap()->fixed_cow_array_map());
   DCHECK(index >= 0 && index < this->length());
   DCHECK(reinterpret_cast<Object*>(value)->IsSmi());
   int offset = kHeaderSize + index * kPointerSize;
   WRITE_FIELD(this, offset, value);
 }
 
@@ skipping 49 matching lines @@
 }
 
 
 void FixedDoubleArray::set_the_hole(int index) {
   DCHECK(map() != GetHeap()->fixed_cow_array_map() &&
          map() != GetHeap()->fixed_array_map());
   int offset = kHeaderSize + index * kDoubleSize;
   WRITE_UINT64_FIELD(this, offset, kHoleNanInt64);
 }
 
+bool FixedDoubleArray::is_the_hole(Isolate* isolate, int index) {
+  return is_the_hole(index);
+}
 
 bool FixedDoubleArray::is_the_hole(int index) {
   return get_representation(index) == kHoleNanInt64;
 }
 
 
 double* FixedDoubleArray::data_start() {
   return reinterpret_cast<double*>(FIELD_ADDR(this, kHeaderSize));
 }
 
@@ skipping 5979 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_