Revert of [runtime] Introduce maps for the likely cases of FromPropertyDescriptor.

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2541 matching lines @@
       Handle<JSObject> object, ShouldThrow should_throw);
 
   MUST_USE_RESULT static Maybe<bool> SetPrototypeUnobserved(
       Handle<JSObject> object, Handle<Object> value, bool from_javascript,
       ShouldThrow should_throw);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject);
 };
 
 
-// JSAccessorPropertyDescriptor is just a JSObject with a specific initial
-// map. This initial map adds in-object properties for "get", "set",
-// "enumerable" and "configurable" properties, as assigned by the
-// FromPropertyDescriptor function for regular accessor properties.
-class JSAccessorPropertyDescriptor: public JSObject {
- public:
-  // Offsets of object fields.
-  static const int kGetOffset = JSObject::kHeaderSize;
-  static const int kSetOffset = kGetOffset + kPointerSize;
-  static const int kEnumerableOffset = kSetOffset + kPointerSize;
-  static const int kConfigurableOffset = kEnumerableOffset + kPointerSize;
-  static const int kSize = kConfigurableOffset + kPointerSize;
-  // Indices of in-object properties.
-  static const int kGetIndex = 0;
-  static const int kSetIndex = 1;
-  static const int kEnumerableIndex = 2;
-  static const int kConfigurableIndex = 3;
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(JSAccessorPropertyDescriptor);
-};
-
-
-// JSDataPropertyDescriptor is just a JSObject with a specific initial map.
-// This initial map adds in-object properties for "value", "writable",
-// "enumerable" and "configurable" properties, as assigned by the
-// FromPropertyDescriptor function for regular data properties.
-class JSDataPropertyDescriptor: public JSObject {
- public:
-  // Offsets of object fields.
-  static const int kValueOffset = JSObject::kHeaderSize;
-  static const int kWritableOffset = kValueOffset + kPointerSize;
-  static const int kEnumerableOffset = kWritableOffset + kPointerSize;
-  static const int kConfigurableOffset = kEnumerableOffset + kPointerSize;
-  static const int kSize = kConfigurableOffset + kPointerSize;
-  // Indices of in-object properties.
-  static const int kValueIndex = 0;
-  static const int kWritableIndex = 1;
-  static const int kEnumerableIndex = 2;
-  static const int kConfigurableIndex = 3;
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataPropertyDescriptor);
-};
-
-
 // Common superclass for FixedArrays that allow implementations to share
 // common accessors and some code paths.
 class FixedArrayBase: public HeapObject {
  public:
   // [length]: length of the array.
   inline int length() const;
   inline void set_length(int value);
 
   // Get and set the length using acquire loads and release stores.
   inline int synchronized_length() const;
@@ skipping 8158 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_