Delete CPS IR

tests/compiler/dart2js/cps_ir/expected/argument_refinement_27.js

-// Expectation for test: 
-// main() {
-//   var x = int.parse('3');
-//   var y = int.parse('a', onError: (e) => 'abcde');
-//   print(x is int);
-//   print(y is String);
-//   print(y.codeUnitAt(x));
-//   print(x is int);
-//   print(y is String);
-// }
-
-function() {
-  var x = P.int_parse("3", null, null), y = P.int_parse("a", new V.main_closure(), null);
-  P.print(typeof x === "number" && Math.floor(x) === x);
-  P.print(typeof y === "string");
-  P.print(J.codeUnitAt$1$s(y, x));
-  P.print(true);
-  P.print(true);
-}