[Clang] Add new WG21 papers(Hagenberg) papers to the C++ status page

Author: cor3ntin

clang/www/cxx_status.html

@@ -251,6 +251,42 @@ <h2 id="cxx26">C++2c implementation status</h2>
   <td><a href="https://wg21.link/P3176R1">P3176R1</a></td>
   <td class="unreleased" align="center">Clang 20</td>
  </tr>
+ <!-- Austria, Winter 2025 -->
+ <tr>
+  <td>Trivial unions</td>
+  <td><a href="https://wg21.link/P3074">P3074R7</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Partial program correctness</td>
+  <td><a href="https://wg21.link/P1494">P1494R5</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Contracts</td>
+  <td><a href="https://wg21.link/P2900">P2900R14</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Defang and deprecate <code>memory_order::consume</code></td>
+  <td><a href="https://wg21.link/P3475">P3475R2</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Concept and variable-template template-parameters</td>
+  <td><a href="https://wg21.link/P2841">P2841R7</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Trivial Relocatability</pre></td>
+  <td><a href="https://wg21.link/P2786">P2786R13</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td><pre>#embed</pre></td>
+  <td><a href="https://wg21.link/P1967">P1967R14</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
 </table>
 </details>