dart2js cps: Pull SetFields into field initializer arguments.

tests/compiler/dart2js/cps_ir/input/constructor_15.dart

Index: tests/compiler/dart2js/cps_ir/input/constructor_15.dart
diff --git a/tests/compiler/dart2js/cps_ir/input/constructor_15.dart b/tests/compiler/dart2js/cps_ir/input/constructor_15.dart
new file mode 100644
index 0000000000000000000000000000000000000000..898b04fa5f7420ed36c1f1aa410e94ef457145f1
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/input/constructor_15.dart
@@ -0,0 +1,14 @@
+// Method to test: generative_constructor(A#)
+class A {
+  var x, y, z;
+  A(x, y) {
+    this.x = x;
+    this.y = y;
+    this.z = this.x / 2;
+  }
+}
+
+main() {
+  print(new A(123, 'sdf').y);
+  try {} finally {} // Do not inline into main.
+}