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

mozilla/nsprpub/pr/src/md/unix/os_Darwin_x86_64.s

 # -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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+# This Source Code Form is subject to the terms of the Mozilla Public
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 # PRInt32 __PR_Darwin_x86_64_AtomicIncrement(PRInt32 *val)
 #
 # Atomically increment the integer pointed to by 'val' and return
 # the result of the increment.
 #
     .text
     .globl __PR_Darwin_x86_64_AtomicIncrement
     .private_extern __PR_Darwin_x86_64_AtomicIncrement
     .align 4
@@ skipping 42 matching lines @@
     .text
     .globl __PR_Darwin_x86_64_AtomicAdd
     .private_extern __PR_Darwin_x86_64_AtomicAdd
     .align 4
 __PR_Darwin_x86_64_AtomicAdd:
     movl %esi, %eax
     lock
     xaddl %eax, (%rdi)
     addl %esi, %eax
     ret