Give each function prototype a fresh copy of the object function map.

src/objects.cc

 // Copyright 2011 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 1052 matching lines @@
         JSValue::cast(this)->value()->ShortPrint(accumulator);
       }
       accumulator->Put('>');
       break;
     }
   }
 }
 
 
 void HeapObject::HeapObjectShortPrint(StringStream* accumulator) {
-  // if (!HEAP->InNewSpace(this)) PrintF("*", this);
   Heap* heap = GetHeap();
   if (!heap->Contains(this)) {
     accumulator->Add("!!!INVALID POINTER!!!");
     return;
   }
   if (!heap->Contains(map())) {
     accumulator->Add("!!!INVALID MAP!!!");
     return;
   }
 
@@ skipping 10681 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single break point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal