Delete CPS IR

tests/compiler/dart2js/cps_ir/expected/argument_refinement_21.js

-// Expectation for test: 
-// main() {
-//   var x = int.parse('1233');
-//   var y = int.parse('1234');
-//   print(x / 2);
-//   print(x is num);
-//   print(y is num);
-//   print(x.compareTo(y));
-//   print(y is num);
-// }
-
-function() {
-  var x = P.int_parse("1233", null, null), y = P.int_parse("1234", null, null), v0;
-  if (typeof x !== "number")
-    return x.$div();
-  P.print(x / 2);
-  P.print(true);
-  v0 = typeof y === "number";
-  P.print(v0);
-  if (!v0)
-    throw H.wrapException(H.argumentErrorValue(y));
-  P.print(x < y ? -1 : x > y ? 1 : x === y ? x === 0 ? 1 / x < 0 === (y === 0 ? 1 / y < 0 : y < 0) ? 0 : 1 / x < 0 ? -1 : 1 : 0 : isNaN(x) ? isNaN(y) ? 0 : 1 : -1);
-  P.print(true);
-}