Delete CPS IR

tests/compiler/dart2js/cps_ir/expected/control_flow_8.js

-// Expectation for test: 
-// main() {
-//   var list = [1,2,3,4,5,6];
-//   for (var x in list) {
-//     print(x);
-//   }
-// }
-
-function() {
-  var list = [1, 2, 3, 4, 5, 6], i = 0, line;
-  for (; i < 6; ++i) {
-    line = H.S(list[i]);
-    if (typeof dartPrint == "function")
-      dartPrint(line);
-    else if (typeof console == "object" && typeof console.log != "undefined")
-      console.log(line);
-    else if (!(typeof window == "object")) {
-      if (!(typeof print == "function"))
-        throw "Unable to print message: " + String(line);
-      print(line);
-    }
-  }
-}