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Bind a label on block entry, implement branching. R=srdjan@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9623005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@5159 260f80e4-7a28-3924-810f-c04153c831b5