Update to NSS_3_12_6_RC1 and NSPR_4_8_4_RTM.

nss/mozilla/nsprpub/pr/src/pthreads/ptthread.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 1028 matching lines @@
     {
         PR_Lock(pt_book.ml);
         while (pt_book.user > pt_book.this_many)
             PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
         if (me->state & PT_THREAD_SYSTEM)
             pt_book.system -= 1;
         else
             pt_book.user -= 1;
         PR_Unlock(pt_book.ml);
 
+        _PR_MD_EARLY_CLEANUP();
+
         _PR_CleanupMW();
         _PR_CleanupTime();
         _PR_CleanupDtoa();
         _PR_CleanupCallOnce();
         _PR_ShutdownLinker();
         _PR_LogCleanup();
         _PR_CleanupNet();
         /* Close all the fd's before calling _PR_CleanupIO */
         _PR_CleanupIO();
         _PR_CleanupCMon();
@@ skipping 600 matching lines @@
         top_sp = *(char**)(thread_tcb + 128);
         PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_GetSP %p \n", top_sp));
         return top_sp;
 }  /* PR_GetSP */
 
 #endif /* !defined(_PR_DCETHREADS) */
 
 #endif  /* defined(_PR_PTHREADS) || defined(_PR_DCETHREADS) */
 
 /* ptthread.c */