Add a pile of tests for unrestricted unions, and advertise support for them.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151992 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 60a3f73..2a1e62f 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -123,6 +123,7 @@
   <li>Generalized constant expressions</li>
   <li>Lambda expressions</li>
   <li>Generalized initializers</li>
+  <li>Unrestricted unions</li>
 </ul>
 
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