Reland deprecation of HAllocateObject in favor of HAllocate.

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 5487 matching lines @@
   MUST_USE_RESULT MaybeObject* Copy();
 
   // Returns the next free property index (only valid for FAST MODE).
   int NextFreePropertyIndex();
 
   // Returns the number of properties described in instance_descriptors
   // filtering out properties with the specified attributes.
   int NumberOfDescribedProperties(DescriptorFlag which = OWN_DESCRIPTORS,
                                   PropertyAttributes filter = NONE);
 
+  // Returns the number of slots allocated for the initial properties
+  // backing storage for instances of this map.
+  int InitialPropertiesLength() {
+    return pre_allocated_property_fields() + unused_property_fields() -
+        inobject_properties();
+  }
+
   // Casting.
   static inline Map* cast(Object* obj);
 
   // Locate an accessor in the instance descriptor.
   AccessorDescriptor* FindAccessor(Name* name);
 
   // Code cache operations.
 
   // Clears the code cache.
   inline void ClearCodeCache(Heap* heap);
@@ skipping 4294 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_