[cxx_status] Update with Belfast motions.

Author: zygoloid

clang/www/cxx_status.html

@@ -879,9 +879,9 @@ <h2 id="cxx20">C++2a implementation status</h2>
       <td class="full" align="center">Clang 9</td>
     </tr>
     <tr id="p0734">
-      <td rowspan="7">Concepts</td>
+      <td rowspan="9">Concepts</td>
       <td><a href="https://wg21.link/p0734r0">P0734R0</a></td>
-      <td rowspan="7" class="none" align="center">No</td>
+      <td rowspan="9" class="none" align="center">No</td>
     </tr>
       <tr> <!-- from Albuquerque -->
         <td><a href="https://wg21.link/p0857r0">P0857R0</a></td>
@@ -901,6 +901,12 @@ <h2 id="cxx20">C++2a implementation status</h2>
       <tr>
         <td><a href="https://wg21.link/p1452r2">P1452R2</a></td>
       </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1972r0">P1972R0</a></td>
+      </tr>
+      <tr>
+        <td><a href="https://wg21.link/p1980r0">P1980R0</a></td>
+      </tr>
     <!-- Albuquerque papers -->
     <tr>
       <td>Range-based for statements with initializer</td>
@@ -918,7 +924,7 @@ <h2 id="cxx20">C++2a implementation status</h2>
       <td class="full" align="center">Clang 8</td>
     </tr>
     <tr>
-      <td rowspan="6">Consistent comparison (<tt>operator&lt;=&gt;</tt>)</td>
+      <td rowspan="7">Consistent comparison (<tt>operator&lt;=&gt;</tt>)</td>
       <td><a href="https://wg21.link/p0515r3">P0515R3</a></td>
       <td class="partial" align="center">Partial</td>
     </tr>
@@ -941,6 +947,10 @@ <h2 id="cxx20">C++2a implementation status</h2>
         <td><a href="https://wg21.link/p1630r1">P1630R1</a></td>
         <td class="partial" align="center">Partial</td>
       </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1946r0">P1946R0</a></td>
+        <td class="none" align="center">No</td>
+      </tr>
     <tr>
       <td>Access checking on specializations</td>
       <td><a href="https://wg21.link/p0692r1">P0692R1</a></td>
@@ -979,10 +989,13 @@ <h2 id="cxx20">C++2a implementation status</h2>
     </tr>
     <!-- Rapperswil papers -->
     <tr>
-      <td>Class types as non-type template parameters</td>
+      <td rowspan="2">Class types as non-type template parameters</td>
       <td><a href="https://wg21.link/p0732r2">P0732R2</a></td>
-      <td class="none" align="center">No</td>
+      <td rowspan="2" class="none" align="center">No</td>
     </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1907r1">P1907R1</a></td>
+      </tr>
     <tr>
       <td>Destroying operator delete</td>
       <td><a href="https://wg21.link/p0722r3">P0722R3</a></td>
@@ -1073,12 +1086,15 @@ <h2 id="cxx20">C++2a implementation status</h2>
         <td><a href="https://wg21.link/p1139r2">P1139R2</a></td>
       </tr>
     <tr>
-      <td>Parenthesized initialization of aggregates</td>
+      <td rowspan="2">Parenthesized initialization of aggregates</td>
       <td><a href="https://wg21.link/p0960r3">P0960R3</a></td>
-      <td class="none" align="center">No</td>
+      <td rowspan="2" class="none" align="center">No</td>
     </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1975r0">P1975R0</a></td>
+      </tr>
     <tr>
-      <td rowspan="4">Modules</td>
+      <td rowspan="6">Modules</td>
       <td><a href="https://wg21.link/p1103r3">P1103R3</a></td>
       <td class="partial" align="center">Partial</td>
     </tr>
@@ -1092,6 +1108,14 @@ <h2 id="cxx20">C++2a implementation status</h2>
       <tr>
         <td><a href="https://wg21.link/p1703r1">P1703R1</a></td>
       </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1874r1">P1874R1</a></td>
+        <td class="partial" align="center">Partial</td>
+      </tr>
+      <tr> <!-- from Belfast -->
+        <td><a href="https://wg21.link/p1979r0">P1979R0</a></td>
+        <td class="none" align="center">No</td>
+      </tr>
     <tr>
       <td>Coroutines</td>
       <td><a href="https://wg21.link/p0912r5">P0912R5</a></td>
@@ -1177,9 +1201,9 @@ <h2 id="ts">Technical specifications and standing documents</h2>
     <th>Available in Clang?</th>
  </tr>
     <tr id="sd6">
-      <td rowspan="6">SD-6: SG10 feature test recommendations</td>
-      <td rowspan="6"><a href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
-      <td rowspan="6">N/A</td>
+      <td rowspan="7">SD-6: SG10 feature test recommendations</td>
+      <td rowspan="7"><a href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6</a></td>
+      <td rowspan="7">N/A</td>
       <td class="full" align="center">
         Clang 3.4 (<a href="https://wg21.link/n3745">N3745</a>)</br>
       </td>
@@ -1209,6 +1233,11 @@ <h2 id="ts">Technical specifications and standing documents</h2>
         WIP (<a href="https://wg21.link/p1353r0">P1353R0</a>)
       </td>
     </tr>
+    <tr>
+      <td class="none" align="center">
+        No (<a href="https://wg21.link/p1902r1">P1902R1</a>)</a>
+      </td>
+    </tr>
     <!-- FIXME: Implement latest recommendations.
     <tr>
       <td class="svn" align="center">