dart2js cps: Scalar replacement of aggregates

tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart b/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
index 9c6d44e3a587ab47be80a7bd696dc9b5001149b7..820be3ea3e5e50700ec0dd3c6aa75e8de650b990 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
@@ -20,10 +20,7 @@ main(x) {
 """,
 r"""
 function(x) {
-  var _box_0 = {};
-  _box_0._captured_x_0 = x;
-  _box_0._captured_x_0 = J.getInterceptor$ns(x = _box_0._captured_x_0).$add(x, "1");
-  P.print(new V.main_a(_box_0)._box_0._captured_x_0);
+  P.print(J.getInterceptor$ns(x).$add(x, "1"));
 }"""),
 
   const TestEntry("""
@@ -55,7 +52,7 @@ main(x) {
 """,
 r"""
 function(x) {
-  P.print(new V.main_a(x)._captured_x_0);
+  P.print(x);
 }"""),
 
   const TestEntry("""
@@ -84,10 +81,7 @@ main() {
 """,
 r"""
 function() {
-  var _box_0 = {};
-  _box_0._captured_x_0 = 122;
-  _box_0._captured_x_0 = _box_0._captured_x_0 + 1;
-  P.print(new V.main_closure(_box_0)._box_0._captured_x_0);
+  P.print(122 + 1);
 }"""),
 
   const TestEntry("""
@@ -121,10 +115,7 @@ main() {
 """,
 r"""
 function() {
-  var _box_0 = {};
-  _box_0._captured_x_0 = 122;
-  _box_0._captured_x_0 = _box_0._captured_x_0 + 1;
-  P.print(new V.main__closure(new V.main_closure(_box_0)._box_0._captured_x_0)._captured_y_1);
+  P.print(122 + 1);
 }"""),
 
   const TestEntry("""