Refactor copying of maps and descriptor arrays.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4892 matching lines @@
                         LookupResult* result);
 
   void LookupTransition(JSObject* holder,
                         String* name,
                         LookupResult* result);
 
   void LookupTransitionOrDescriptor(JSObject* holder,
                                     String* name,
                                     LookupResult* result);
 
+  MUST_USE_RESULT MaybeObject* RawCopy(int instance_size);
+  MUST_USE_RESULT MaybeObject* CopyWithPreallocatedFieldDescriptors();
   MUST_USE_RESULT MaybeObject* CopyDropDescriptors();
+  MUST_USE_RESULT MaybeObject* CopyReplaceDescriptors(
+      DescriptorArray* descriptors);
 
   MUST_USE_RESULT MaybeObject* CopyNormalized(PropertyNormalizationMode mode,
                                               NormalizedMapSharingMode sharing);
 
   // Returns a copy of the map, with all transitions dropped from the
   // instance descriptors.
   MUST_USE_RESULT MaybeObject* CopyDropTransitions(
       DescriptorArray::SharedMode shared_mode);
 
   // Returns the property index for name (only valid for FAST MODE).
@@ skipping 3954 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_