[clang][NFC] Update CWG issues list

Author: Endilll

clang/www/cxx_dr_status.html

@@ -17198,6 +17198,12 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td>open</td>
     <td>Clarify implicit conversion sequence from <I>cv</I> <TT>T</TT> to <TT>T</TT></td>
     <td align="center">Not resolved</td>
+  </tr>
+  <tr class="open" id="2899">
+    <td><a href="https://cplusplus.github.io/CWG/issues/2899.html">2899</a></td>
+    <td>open</td>
+    <td>Bad value representations should cause undefined behavior</td>
+    <td align="center">Not resolved</td>
   </tr></table>
 
 </div>