Fix some out-of-line constant pool garbage collection bugs.

src/objects-visiting-inl.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 464 matching lines @@
 template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitConstantPoolArray(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
   ConstantPoolArray* constant_pool = ConstantPoolArray::cast(object);
   if (constant_pool->count_of_ptr_entries() > 0) {
     int first_ptr_offset = constant_pool->OffsetOfElementAt(
         constant_pool->first_ptr_index());
     int last_ptr_offset = constant_pool->OffsetOfElementAt(
         constant_pool->first_ptr_index() +
-        constant_pool->count_of_ptr_entries());
+        constant_pool->count_of_ptr_entries() - 1);
     StaticVisitor::VisitPointers(
         heap,
         HeapObject::RawField(object, first_ptr_offset),
         HeapObject::RawField(object, last_ptr_offset));
   }
 }
 
 
 template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitJSFunction(
@@ skipping 432 matching lines @@
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_