Remove the debugger_ field from Isolate in a PRODUCT build

runtime/vm/dart.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 "vm/dart.h"
 
 #include "vm/become.h"
 #include "vm/clustered_snapshot.h"
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
@@ skipping 599 matching lines @@
   is_kernel_isolate = KernelIsolate::IsKernelIsolate(I);
 #endif
   ServiceIsolate::MaybeMakeServiceIsolate(I);
   if (!ServiceIsolate::IsServiceIsolate(I) && !is_kernel_isolate) {
     I->message_handler()->set_should_pause_on_start(
         FLAG_pause_isolates_on_start);
     I->message_handler()->set_should_pause_on_exit(FLAG_pause_isolates_on_exit);
   }
 
   ServiceIsolate::SendIsolateStartupMessage();
+#if !defined(PRODUCT)
   if (FLAG_support_debugger) {
     I->debugger()->NotifyIsolateCreated();
   }
+#endif
+
   // Create tag table.
   I->set_tag_table(GrowableObjectArray::Handle(GrowableObjectArray::New()));
   // Set up default UserTag.
   const UserTag& default_tag = UserTag::Handle(UserTag::DefaultTag());
   I->set_current_tag(default_tag);
 
   if (FLAG_keep_code) {
     I->set_deoptimized_code_array(
         GrowableObjectArray::Handle(GrowableObjectArray::New()));
   }
@@ skipping 114 matching lines @@
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart