Profiler fixes

runtime/platform/thread_win.cc

 // Copyright (c) 2012, 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 "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "platform/thread.h"
 
 #include <process.h>  // NOLINT
@@ skipping 275 matching lines @@
       } else if (current == waiters_head_) {
         waiters_head_ = waiters_head_->next_;
       } else if (current == waiters_tail_) {
         ASSERT(previous != NULL);
         waiters_tail_ = previous;
         previous->next_ = NULL;
       } else {
         ASSERT(previous != NULL);
         previous->next_ = current->next_;
       }
+      // Clear next.
+      wait_data->next_ = NULL;
       break;
     }
     previous = current;
     current = current->next_;
   }
   LeaveCriticalSection(&waiters_cs_);
 }
 
 
 void MonitorData::SignalAndRemoveFirstWaiter() {
@@ skipping 130 matching lines @@
   // timeout before we signal it, that object will get an extra
   // signal. This will be treated as a spurious wake-up and is OK
   // since all uses of monitors should recheck the condition after a
   // Wait.
   data_.SignalAndRemoveAllWaiters();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)