diff -r 000000000000 -r 6474c204b198 js/src/assembler/wtf/Assertions.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/assembler/wtf/Assertions.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef assembler_wtf_Assertions_h
+#define assembler_wtf_Assertions_h
+
+#include "assembler/wtf/Platform.h"
+#include "mozilla/Assertions.h"
+
+#ifndef DEBUG
+   /*
+    * Prevent unused-variable warnings by defining the macro WTF uses to test
+    * for assertions taking effect.
+    */
+#  define ASSERT_DISABLED 1
+#endif
+
+#ifndef ASSERT
+#define ASSERT(assertion) MOZ_ASSERT(assertion)
+#endif
+#define ASSERT_UNUSED(variable, assertion) do { \
+    (void)variable; \
+    ASSERT(assertion); \
+} while (0)
+#define ASSERT_NOT_REACHED() MOZ_ASSUME_UNREACHABLE("wtf/Assertions.h")
+#define CRASH() MOZ_CRASH()
+#define COMPILE_ASSERT(exp, name) static_assert(exp, #name)
+
+#endif /* assembler_wtf_Assertions_h */