Disable map-check relying on cache behavior sensitive to GC-timing

R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23892005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16544 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/track-fields.js

@@ -211,7 +211,6 @@ assertFalse(%HaveSameMap(o18, o19));
 delete o18.to_delete;
 delete o19.to_delete;
 
-assertTrue(%HaveSameMap(o18, o19));
 assertEquals(1, o18.field2);
 assertEquals(1.6, o19.field2);