[committed] libstdc++: Document P1739R4 status [PR100139]

[Jonathan Wakely]

We should document the status of this unimplemented feature.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/100139
	* doc/xml/manual/status_cxx2020.xml: Add P1739R4 to status table.
	* doc/html/manual/status.html: Regenerate.

Tested powerpc64le-linux. Committed to trunk.

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commit 926d4a71c7e5a2f7d17a4f943d6e7fe9f1e3ba55
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Aug 19 11:44:57 2021

    libstdc++: Document P1739R4 status [PR100139]
    
    We should document the status of this unimplemented feature.
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/100139
            * doc/xml/manual/status_cxx2020.xml: Add P1739R4 to status table.
            * doc/html/manual/status.html: Regenerate.

diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2020.xml b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
index ca12d8023f1..45de79311a1 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
@@ -1437,6 +1437,17 @@ or any notes about the implementation.
       <entry />
     </row>
 
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry> Avoid template bloat for <code>safe_ranges</code> in combination with ?subrange-y? view adaptors.</entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1739r4.html">
+        P1739R4 </link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
   </tbody>
 </tgroup>
 </table>