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When transforming if (foo) bar; to foo && bar make sure that bar is compiled with the correct precedence. In particular avoid foo && toto = 499; instead of foo && (toto = 499). Fixes issue 3862. Review URL: https://chromiumcodereview.appspot.com//10669035 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9157 260f80e4-7a28-3924-810f-c04153c831b5