add toc

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44780 91177308-0d34-0410-b5e6-96231b3b80d8

www/comparison.html

@@ -30,6 +30,13 @@
     <p>Please email cfe-dev if you think we should add another compiler to this
        list or if you think some characterization is unfair here.</p>
     
+    <ul>
+    <li><a href="#gcc">Clang vs GCC</a> (GNU Compiler Collection)</li>
+    <li><a href="#elsa">Clang vs Elsa</a> (Elkhound-based C++ Parser)</li>
+    <li><a href="#pcc">Clang vs PCC</a> (Portable C Compiler)</li>
+    </ul>
+    
+    
     <!--=====================================================================-->
     <h2><a name="gcc">Clang vs GCC (GNU Compiler Collection)</a></h2>
     <!--=====================================================================-->