dart2js cps: Get typed selectors for compound operators.

tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart b/tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart
index f362bb304b7d8a9651d21c34cd1a7abf481c1283..41073afdd9cd63768e16d6d16f4aaacadcdf2ddb 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_interceptors_test.dart
@@ -36,14 +36,14 @@ r"""
 function() {
   var l = ["hest", ["h", "e", "s", "t"]], i = 0, x, j;
   P.print(J.getInterceptor$as(l).get$length(l));
-  while (J.getInterceptor$n(i).$lt(i, J.getInterceptor$as(l).get$length(l))) {
+  while (i < J.getInterceptor$as(l).get$length(l)) {
     x = J.getInterceptor$as(l).$index(l, i);
     j = 0;
-    while (J.getInterceptor$n(j).$lt(j, J.getInterceptor$as(x).get$length(x))) {
+    while (j < J.getInterceptor$as(x).get$length(x)) {
       P.print(J.getInterceptor$as(x).$index(x, j));
-      j = J.getInterceptor$ns(j).$add(j, 1);
+      j = j + 1;
     }
-    i = J.getInterceptor$ns(i).$add(i, 1);
+    i = i + 1;
   }
   return null;
 }"""),