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We can remove the case of blocks containing a single instruction because every basic block is now terminated with a Goto or Branch (except for the graph entry, which is handled specially). Review URL: https://chromiumcodereview.appspot.com//10825198 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10281 260f80e4-7a28-3924-810f-c04153c831b5