Update NSS to 3.21 RTM and NSPR to 4.11 RTM

nspr/pr/include/prtypes.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/. */
 
 /*
 ** File:                prtypes.h
 ** Description: Definitions of NSPR's basic types
 **
 ** Prototypes and macros used to make up for deficiencies that we have found
@@ skipping 508 matching lines @@
 ** http://java.sun.com/docs/books/vmspec/index.html.)
 */
 #ifdef _WIN64
 typedef PRInt64 PRWord;
 typedef PRUint64 PRUword;
 #else
 typedef long PRWord;
 typedef unsigned long PRUword;
 #endif
 
+/*
+ * PR_PRETEND_NORETURN, specified at the end of a function declaration,
+ * indicates that for the purposes of static analysis, this function does not
+ * return.  (The function definition does not need to be annotated.)
+ *
+ * void PR_Assert(const char *s, const char *file, PRIntn ln)
+ *     PR_PRETEND_NORETURN;
+ *
+ * Some static analyzers, like scan-build from clang, can use this information
+ * to eliminate false positives.  From the upstream documentation of
+ * scan-build:
+ *     This attribute is useful for annotating assertion handlers that actually
+ *     can return, but for the purpose of using the analyzer we want to pretend
+ *     that such functions do not return.
+ */
+#ifdef __clang_analyzer__
+#if __has_extension(attribute_analyzer_noreturn)
+#define PR_PRETEND_NORETURN __attribute__((analyzer_noreturn))
+#endif
+#endif
+
+#ifndef PR_PRETEND_NORETURN
+#define PR_PRETEND_NORETURN /* no support */
+#endif
+
 #if defined(NO_NSPR_10_SUPPORT)
 #else
 /********* ???????????????? FIX ME       ??????????????????????????? *****/
 /********************** Some old definitions until pr=>ds transition is done ***/
 /********************** Also, we are still using NSPR 1.0. GC ******************/
 /*
 ** Fundamental NSPR macros, used nearly everywhere.
 */
 
 #define PR_PUBLIC_API           PR_IMPLEMENT
@@ skipping 33 matching lines @@
 ** The macro can be used only in places where an "extern" declaration is
 ** allowed.
 */
 #define PR_STATIC_ASSERT(condition) \
     extern void pr_static_assert(int arg[(condition) ? 1 : -1])
 
 PR_END_EXTERN_C
 
 #endif /* prtypes_h___ */