Update the release notes about the new loop vectorizer.

llvm-svn: 166113

llvm/docs/ReleaseNotes.html

@@ -466,6 +466,10 @@ Release Notes</a>.</h1>
 <p>In addition to many minor performance tweaks and bug fixes, this release
    includes a few major enhancements and additions to the optimizers:</p>
 
+<p> Loop Vectorizer -  We've added a basic loop vectorizer and we are now able
+    to vectorize small loops. In this release the loop vectorizer is only
+    available using the stand alone command line tools. </p>
+
 <ul>
   <li>...</li>
 </ul>