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This is a version of the Lengauer-Tarjan algorithm that is both simpler and faster. R=srdjan@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9729015 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@5737 260f80e4-7a28-3924-810f-c04153c831b5