Add support for enabling DCHECKs in release mode

src/deoptimizer.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEOPTIMIZER_H_
 #define V8_DEOPTIMIZER_H_
 
 #include "src/v8.h"
 
 #include "src/allocation.h"
@@ skipping 424 matching lines @@
   // Output frame information. Only used during heap object materialization.
   List<Handle<JSFunction> > jsframe_functions_;
   List<bool> jsframe_has_adapted_arguments_;
 
   // Materialized objects. Only used during heap object materialization.
   List<Handle<Object> >* materialized_values_;
   List<Handle<Object> >* materialized_objects_;
   int materialization_value_index_;
   int materialization_object_index_;
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   DisallowHeapAllocation* disallow_heap_allocation_;
-#endif  // DEBUG
+#endif  // DCHECK_IS_ON
 
   CodeTracer::Scope* trace_scope_;
 
   static const int table_entry_size_;
 
   friend class FrameDescription;
   friend class DeoptimizedFrameInfo;
 };
 
 
@@ skipping 523 matching lines @@
   Object** parameters_;
   Object** expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_