Remove many features when building product mode

runtime/vm/gc_marker.cc

 // Copyright (c) 2011, 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 "vm/gc_marker.h"
 
 #include <map>
 #include <utility>
 #include <vector>
 
@@ skipping 544 matching lines @@
       if (raw_obj->IsOldObject() && !raw_obj->IsMarked()) {
         // Object has become garbage. Replace it will null.
         *current = Object::null();
       }
     }
   }
 };
 
 
 void GCMarker::ProcessObjectIdTable(Isolate* isolate) {
+  if (!FLAG_support_service) {
+    return;
+  }
   ObjectIdRingClearPointerVisitor visitor(isolate);
   ObjectIdRing* ring = isolate->object_id_ring();
   ASSERT(ring != NULL);
   ring->VisitPointers(&visitor);
 }
 
 
 class MarkTask : public ThreadPool::Task {
  public:
   MarkTask(GCMarker* marker,
@@ skipping 167 matching lines @@
       barrier.Exit();
     }
     delay_set.ClearReferences();
     ProcessWeakTables(page_space);
     ProcessObjectIdTable(isolate);
   }
   Epilogue(isolate, invoke_api_callbacks);
 }
 
 }  // namespace dart