Reland "Mark internal AccessorInfo properties as 'special data properties'"

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 84bb8007f2383997375a2c19226b11ce529aa1e5..d6f3f41dba3cf04d9251f65b0329daf25406f8dc 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10517,6 +10517,9 @@ class AccessorInfo: public Struct {
   inline bool all_can_write();
   inline void set_all_can_write(bool value);
 
+  inline bool is_special_data_property();
+  inline void set_is_special_data_property(bool value);
+
   inline PropertyAttributes property_attributes();
   inline void set_property_attributes(PropertyAttributes attributes);
 
@@ -10549,7 +10552,8 @@ class AccessorInfo: public Struct {
   // Bit positions in flag.
   static const int kAllCanReadBit = 0;
   static const int kAllCanWriteBit = 1;
-  class AttributesField : public BitField<PropertyAttributes, 2, 3> {};
+  static const int kSpecialDataProperty = 2;
+  class AttributesField : public BitField<PropertyAttributes, 3, 3> {};
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo);
 };