More changes to use #ifndef PRODUCT ... #endif explicitly instead of relying on compiler magic.

runtime/vm/isolate.h

 // Copyright (c) 2013, 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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 565 matching lines @@
   intptr_t loading_invalidation_gen() {
     return AtomicOperations::LoadRelaxedIntPtr(&loading_invalidation_gen_);
   }
 
   // Used by background compiler which field became boxed and must trigger
   // deoptimization in the mutator thread.
   void AddDeoptimizingBoxedField(const Field& field);
   // Returns Field::null() if none available in the list.
   RawField* GetDeoptimizingBoxedField();
 
+#ifndef PRODUCT
   RawObject* InvokePendingServiceExtensionCalls();
   void AppendServiceExtensionCall(const Instance& closure,
                            const String& method_name,
                            const Array& parameter_keys,
                            const Array& parameter_values,
                            const Instance& reply_port,
                            const Instance& id);
   void RegisterServiceExtensionHandler(const String& name,
                                        const Instance& closure);
   RawInstance* LookupServiceExtensionHandler(const String& name);
+#endif
 
   static void VisitIsolates(IsolateVisitor* visitor);
 
   // Handle service messages until we are told to resume execution.
   void PauseEventHandler();
 
   void AddClosureFunction(const Function& function) const;
   RawFunction* LookupClosureFunction(const Function& parent,
                                      TokenPosition token_pos) const;
   intptr_t FindClosureIndex(const Function& needle) const;
@@ skipping 381 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_