Update to NSPR 4.9.5, part 1: MPL 2 upgrade only.

mozilla/nsprpub/pr/src/md/unix/os_Darwin_x86.s

 # -*- 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
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-# Netscape Communications Corporation.
-# Portions created by the Initial Developer are Copyright (C) 2003
-# the Initial Developer. All Rights Reserved.
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-# Contributor(s):
-#   Josh Aas <josh@mozilla.com>
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #
 # Based on os_Linux_x86.s
 #
 
 #
 # PRInt32 __PR_Darwin_x86_AtomicIncrement(PRInt32 *val);
 #
 # Atomically increment the integer pointed to by 'val' and return
 # the result of the increment.
@@ skipping 55 matching lines @@
     .private_extern __PR_Darwin_x86_AtomicAdd
     .align 4
 __PR_Darwin_x86_AtomicAdd:
     movl 4(%esp), %ecx
     movl 8(%esp), %eax
     movl %eax, %edx
     lock
     xaddl %eax, (%ecx)
     addl %edx, %eax
     ret