Fix order of box and types for constructor-body invocations.

tests/language/constructor12_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:expect/expect.dart";
+
+class B {
+  final z;
+  B(this.z);
+
+  foo() => this.z;
+}
+
+class A<T> extends B {
+  var captured, captured2;
+  var typedList;
+
+  // p must be inside a box (in dart2js).
+  A(p) : captured = (() => p), super(p++) {
+    // Make non-inlinable.
+    try {} catch(e) {}
+
+    captured2 = () => p++;
+
+    // In the current implementation of dart2js makes the generic type an
+    // argument to the body.
+    typedList = <T>[];
+  }
+
+  foo() => captured();
+  bar() => captured2();
+}
+
+@NoInline()
+@AssumeDynamic()
+confuse(x) => x;
+
+main() {
+  var a = confuse(new A<int>(1));
+  var a2 = confuse(new A(2));
+  var b = confuse(new B(3));
+  Expect.equals(2, a.foo());
+  Expect.equals(3, a2.foo());
+  Expect.equals(3, b.foo());
+  Expect.equals(1, a.z);
+  Expect.equals(2, a2.z);
+  Expect.equals(3, b.z);
+  Expect.isTrue(a is A<int>);
+  Expect.isFalse(a is A<String>);
+  Expect.isTrue(a2 is A<int>);
+  Expect.isTrue(a2 is A<String>);
+  Expect.equals(2, a.bar());
+  Expect.equals(3, a2.bar());
+  Expect.equals(3, a.foo());
+  Expect.equals(4, a2.foo());
+  Expect.equals(0, a.typedList.length);
+  Expect.equals(0, a2.typedList.length);
+  a.typedList.add(499);
+  Expect.equals(1, a.typedList.length);
+  Expect.equals(0, a2.typedList.length);
+  Expect.isTrue(a.typedList is List<int>);
+  Expect.isTrue(a2.typedList is List<int>);
+  Expect.isFalse(a.typedList is List<String>);
+  Expect.isTrue(a2.typedList is List<String>);
+}