42295eaa60
Avoids problem in http://code.google.com/p/dart/issues/detail?id=2913 by breaking equivalences that go around a loop. BUG=2913 Review URL: https://chromiumcodereview.appspot.com//10375048 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@7407 260f80e4-7a28-3924-810f-c04153c831b5