Add trace output when recompilation queues are flushed.

src/optimizing-compiler-thread.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 154 matching lines @@
 }
 
 
 void OptimizingCompilerThread::Flush() {
   ASSERT(!IsOptimizerThread());
   Release_Store(&stop_thread_, static_cast<AtomicWord>(FLUSH));
   input_queue_semaphore_.Signal();
   stop_semaphore_.Wait();
   FlushOutputQueue(true);
   if (FLAG_concurrent_osr) FlushOsrBuffer(true);
+  if (FLAG_trace_concurrent_recompilation) {
+    PrintF("  ** Flushed concurrent recompilation queues.\n");
+  }
 }
 
 
 void OptimizingCompilerThread::Stop() {
   ASSERT(!IsOptimizerThread());
   Release_Store(&stop_thread_, static_cast<AtomicWord>(STOP));
   input_queue_semaphore_.Signal();
   stop_semaphore_.Wait();
 
   if (FLAG_concurrent_recompilation_delay != 0) {
@@ skipping 144 matching lines @@
 #ifdef DEBUG
 bool OptimizingCompilerThread::IsOptimizerThread() {
   if (!FLAG_concurrent_recompilation) return false;
   LockGuard<Mutex> lock_guard(&thread_id_mutex_);
   return ThreadId::Current().ToInteger() == thread_id_;
 }
 #endif
 
 
 } }  // namespace v8::internal