[c++20] P0780R2: Support pack-expansion of init-captures.

This permits an init-capture to introduce a new pack:

  template<typename ...T> auto x = [...a = T()] { /* a is a pack */ };

To support this, the mechanism for allowing ParmVarDecls to be packs has
been extended to support arbitrary local VarDecls.

llvm-svn: 361300
diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html
index 5acdd56..968d453 100755
--- a/clang/www/cxx_status.html
+++ b/clang/www/cxx_status.html
@@ -949,7 +949,7 @@
     <tr>
       <td>Pack expansion in lambda <i>init-capture</i></td>
       <td><a href="http://wg21.link/p0780r2">P0780R2</a></td>
-      <td class="none" align="center">No</td>
+      <td class="svn" align="center">SVN</td>
     </tr>
     <!-- Rapperswil papers -->
     <tr>