Remove the debugger_ field from Isolate in a PRODUCT build

runtime/vm/dart_api_impl.cc

 // 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.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "lib/stacktrace.h"
 #include "platform/assert.h"
@@ skipping 5615 matching lines @@
   // invoking of _completeDeferredLoads) into Isolate::DoneLoading().
 
   // Finalize all classes if needed.
   Dart_Handle state = Api::CheckAndFinalizePendingClasses(T);
   if (::Dart_IsError(state)) {
     return state;
   }
 
   I->DoneFinalizing();
 
+#if !defined(PRODUCT)
   // Now that the newly loaded classes are finalized, notify the debugger
   // that new code has been loaded. If there are latent breakpoints in
   // the new code, the debugger convert them to unresolved source breakpoints.
   // The code that completes the futures (invoked below) may call into the
   // newly loaded code and trigger one of these breakpoints.
   if (FLAG_support_debugger) {
     I->debugger()->NotifyDoneLoading();
   }
+#endif
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
   if (FLAG_enable_mirrors) {
     // Notify mirrors that MirrorSystem.libraries needs to be recomputed.
     const Library& libmirrors = Library::Handle(Z, Library::MirrorsLibrary());
     const Field& dirty_bit = Field::Handle(
         Z, libmirrors.LookupLocalField(String::Handle(String::New("_dirty"))));
     ASSERT(!dirty_bit.IsNull() && dirty_bit.is_static());
     dirty_bit.SetStaticValue(Bool::True());
   }
@@ skipping 1016 matching lines @@
 #endif
 }
 
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context) {
 #ifndef PRODUCT
   Profiler::DumpStackTrace(context);
 #endif
 }
 
 }  // namespace dart