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[wwwdocs] Mention ubsan in 4.9 changes.html


Maybe it'd be worth noting in changes.html that GCC now has the
ubsan...

Ok to apply?

--- www/htdocs/gcc-4.9/changes.html.mp	2013-09-19 16:54:32.113724993 +0200
+++ www/htdocs/gcc-4.9/changes.html	2013-09-19 17:07:05.418030738 +0200
@@ -38,6 +38,14 @@
     <li>AddressSanitizer, a fast memory error detector, is now available on ARM.
     </li>
   </ul>
+  <ul>
+    <li>UndefinedBehaviorSanitizer, a fast undefined behavior detector,
+        has been added and can be enabled via <code>-fsanitize=undefined</code>.
+	 Various computations will be instrumented to detect undefined behavior
+	 at runtime.  UndefinedBehaviorSanitizer is currently available for C
+	 and C++ languages.
+    </li>
+  </ul>
 
 <h2>New Languages and Language specific improvements</h2>
 
	Marek


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