Update NSS to 3.21 RTM and NSPR to 4.11 RTM

nspr/pr/include/pratom.h

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 
 /* GLOBAL FUNCTIONS:
 ** DESCRIPTION:
 **     PR Atomic operations
 */
 
@@ skipping 89 matching lines @@
 #elif ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && \
       ((defined(__APPLE__) && \
            (defined(__ppc__) || defined(__i386__) || defined(__x86_64__))) || \
        (defined(__linux__) && \
            ((defined(__i386__) && \
            defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
            defined(__ia64__) || defined(__x86_64__) || \
            defined(__powerpc__) || \
            (defined(__arm__) && \
            defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
-           defined(__aarch64__) || defined(__alpha))))
+           defined(__aarch64__) || defined(__alpha) || \
+           (defined(__mips__) && \
+           defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)))))
 
 /*
  * Because the GCC manual warns that some processors may support
  * reduced functionality of __sync_lock_test_and_set, we test for the
  * processors that we believe support a full atomic exchange operation.
  */
 
 #define PR_ATOMIC_INCREMENT(val) __sync_add_and_fetch(val, 1)
 #define PR_ATOMIC_DECREMENT(val) __sync_sub_and_fetch(val, 1)
 #define PR_ATOMIC_SET(val, newval) __sync_lock_test_and_set(val, newval)
@@ skipping 66 matching lines @@
 **    PR_SUCCESS - if successfully deleted
 **        PR_FAILURE - if the stack is not empty
 **                                      PR_GetError will return
 **                                              PR_INVALID_STATE_ERROR - stack is not empty
 */
 NSPR_API(PRStatus)              PR_DestroyStack(PRStack *stack);
 
 PR_END_EXTERN_C
 
 #endif /* pratom_h___ */