cpsir: implementation of jsinterop in cps ir

tests/html/js_typed_interop_default_arg_test.dart

Index: tests/html/js_typed_interop_default_arg_test.dart
diff --git a/tests/html/js_typed_interop_default_arg_test.dart b/tests/html/js_typed_interop_default_arg_test.dart
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+++ b/tests/html/js_typed_interop_default_arg_test.dart
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+// 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.
+
+@JS()
+library js_typed_interop_test;
+
+import 'dart:html';
+
+import 'package:expect/expect.dart' show NoInline;
+import 'package:js/js.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+_injectJs() {
+  document.body.append(new ScriptElement()
+    ..type = 'text/javascript'
+    ..innerHtml = r"""
+  var Foo = {
+    get42: function(b) { return arguments.length >= 1 ? b : 42; },
+    get43: function(b) { return arguments.length >= 1 ? b : 43; }
+  };
+""");
+}
+
+@JS()
+class Foo {
+  // Note: it's invalid to provide a default value.
+  external static num get42([num b
+      = 3  /// default_value: compile-time error
+  ]);
+  external static num get43([num b]);
+}
+
+main() {
+  _injectJs();
+  useHtmlConfiguration();
+
+  test('call directly from dart', () {
+    expect(Foo.get42(2), 2);
+    expect(Foo.get42(), 42);
+  });
+
+  test('call tearoff from dart with arg', () {
+    var f = Foo.get42;
+    expect(f(2), 2); /// explicit_argument: ok
+  });
+
+  test('call tearoff from dart with default', () {
+    var f = Foo.get42;
+    // Note: today both SSA and CPS remove the extra argument on static calls,
+    // but they fail to do so on tearoffs.
+    expect(f(), 3); /// default_value: continued
+
+    f = Foo.get43;
+    expect(f(), 43);
+  });
+}