Delete CPS IR

tests/compiler/dart2js/cps_ir/expected/supercall_2.js

-// Expectation for test: 
-// // TODO(sigmund): change this to check method "function(Sub#+)" once we provide
-// // a way to disable inlining of Sub#+, which is compiled to something like:
-// // function(x) {
-// //   var v0, v1, v2;
-// //   v0 = 1;
-// //   v1 = J.getInterceptor$ns(x).$add(x, v0);
-// //   v2 = this;
-// //   return V.Base.prototype.$add.call(null, v2, v1);
-// // }
-// 
-// class Base {
-//   m(x) {
-//     print(x+1000);
-//   }
-//   operator+(x) => m(x+10);
-// }
-// class Sub extends Base {
-//   m(x) => super.m(x+100);
-//   operator+(x) => super + (x+1);
-// }
-// main() {
-//   new Sub() + 10000;
-// }
-
-function() {
-  var v0 = V.Sub$();
-  V.Base.prototype.$add.call(v0, v0, 10001);
-}