Delete CPS IR

tests/compiler/dart2js/cps_ir/expected/control_flow_9.js

-// Expectation for test: 
-// main() {
-//   var xs = ['x', 'y', 'z'], ys = ['A', 'B', 'C'];
-//   var xit = xs.iterator, yit = ys.iterator;
-//   while (xit.moveNext() && yit.moveNext()) {
-//     print(xit.current);
-//     print(yit.current);
-//   }
-// }
-
-function() {
-  var xs = ["x", "y", "z"], ys = ["A", "B", "C"], i = 0, i1 = 0, current, current1;
-  for (; i < 3; ++i, ++i1) {
-    current = xs[i];
-    if (!(i1 < 3))
-      break;
-    current1 = ys[i1];
-    P.print(current);
-    P.print(current1);
-  }
-}