Remove temporary code used to debug issue #26101.

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 1385 matching lines @@
 
 void Isolate::Run() {
   message_handler()->Run(Dart::thread_pool(),
                          RunIsolate,
                          ShutdownIsolate,
                          reinterpret_cast<uword>(this));
 }
 
 
 void Isolate::AddClosureFunction(const Function& function) const {
-  // TODO(regis): remove once debugging complete.
-  if (Compiler::IsBackgroundCompilation()) {
-    NOT_IN_PRODUCT(Profiler::DumpStackTrace(true /*native*/));
-    UNREACHABLE();
-  }
   ASSERT(!Compiler::IsBackgroundCompilation());
   GrowableObjectArray& closures =
       GrowableObjectArray::Handle(object_store()->closure_functions());
   ASSERT(!closures.IsNull());
   ASSERT(function.IsNonImplicitClosureFunction());
   closures.Add(function, Heap::kOld);
 }
 
 
 // If the linear lookup turns out to be too expensive, the list
@@ skipping 1295 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart