Add product mode:

runtime/vm/heap.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/globals.h"
 #include "vm/pages.h"
 #include "vm/scavenger.h"
 #include "vm/spaces.h"
 #include "vm/verifier.h"
 #include "vm/weak_table.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class ObjectPointerVisitor;
 class ObjectSet;
 class ServiceEvent;
 class VirtualMemory;
 
-DECLARE_FLAG(bool, verbose_gc);
 DECLARE_FLAG(bool, verify_before_gc);
 DECLARE_FLAG(bool, verify_after_gc);
 DECLARE_FLAG(bool, gc_at_alloc);
 
 class Heap {
  public:
   enum Space {
     kNew,
     kOld,
     kCode,
@@ skipping 351 matching lines @@
   explicit WritableVMIsolateScope(Thread* thread, bool include_code_pages);
   ~WritableVMIsolateScope();
 
  private:
   bool include_code_pages_;
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_