[builtins] Introduce DeleteProperty builtin

src/property-details.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_PROPERTY_DETAILS_H_
 #define V8_PROPERTY_DETAILS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 // TODO(ishell): remove once FLAG_track_constant_fields is removed.
@@ skipping 322 matching lines @@
   // constants can be embedded in generated code.
   class KindField : public BitField<PropertyKind, 0, 1> {};
   class LocationField : public BitField<PropertyLocation, KindField::kNext, 1> {
   };
   class ConstnessField
       : public BitField<PropertyConstness, LocationField::kNext, 1> {};
   class AttributesField
       : public BitField<PropertyAttributes, ConstnessField::kNext, 3> {};
   static const int kAttributesReadOnlyMask =
       (READ_ONLY << AttributesField::kShift);
+  static const int kAttributesDontDeleteMask =
+      (DONT_DELETE << AttributesField::kShift);
 
   // Bit fields for normalized objects.
   class PropertyCellTypeField
       : public BitField<PropertyCellType, AttributesField::kNext, 2> {};
   class DictionaryStorageField
       : public BitField<uint32_t, PropertyCellTypeField::kNext, 23> {};
 
   // Bit fields for fast objects.
   class RepresentationField
       : public BitField<uint32_t, AttributesField::kNext, 4> {};
@@ skipping 62 matching lines @@
                                              PropertyConstness b) {
   return a == kMutable ? kMutable : b;
 }
 
 std::ostream& operator<<(std::ostream& os,
                          const PropertyAttributes& attributes);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROPERTY_DETAILS_H_