Move old multicol tests to a separate directory.

LayoutTests/fast/multicol/old/paginated-layer-crash.html

 <style>
     .section {
         position: absolute;
         -webkit-column-count: 2;
     }
 
     .graph {
         overflow: hidden;
     }
 
@@ skipping 11 matching lines @@
 </p>
 <div class="section">
     <div class="graph">
         <div class="img"></div>
     </div>
 </div>
 <script>
     if (window.testRunner)
         testRunner.dumpAsText();
 </script>