Link to the autovectorization EuroLLVM slides in the release notes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154830 91177308-0d34-0410-b5e6-96231b3b80d8
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+++ b/docs/ReleaseNotes.html
@@ -313,7 +313,9 @@
       <code>-unroll-runtime</code> flag.</li>
   <li>A new basic-block autovectorization pass is available. Pass
       <code>-vectorize</code> to run this pass along with some associated
-      post-vectorization cleanup passes.</li>
+      post-vectorization cleanup passes. For more information, see the EuroLLVM
+      2012 slides: <a href="http://llvm.org/devmtg/2012-04-12/Slides/Hal_Finkel.pdf">
+      Autovectorization with LLVM</a>.</li>
   <li>....</li>
 </ul>