Add a small example which shows a vectorizable loop with a non-pow-of-two count

llvm-svn: 166169

llvm/docs/ReleaseNotes.html

@@ -466,9 +466,17 @@ 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
+<p> Loop Vectorizer - We've added a basic loop vectorizer and we are now able
     to vectorize small loops. The loop vectorizer is disabled by default and
-    can be enabled using the -mllvm -vectorize flags. </p>
+    can be enabled using the -mllvm -vectorize flags. We can vectorize this code:
+
+    <pre class="doc_code">
+    for (i=0; i&lt;n; i++) {
+      a[i] = b[i+1] + c[i+3] + i;
+    }
+    </pre>
+
+ </p>
 
 <ul>
   <li>...</li>