Add language test for closurization of a closure's call method.

tests/language/call_closurization_test.dart

+// Copyright (c) 2014, 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.
+// VMOptions=--optimization_counter_threshold=10
+
+import "package:expect/expect.dart";
+
+main() {
+  bar(a) {
+    return a is String;
+  }
+  var bar_tearOff = bar.call;
+
+  for (var i = 0; i < 20; i++) {
+    Expect.isFalse(bar_tearOff(1));
+    Expect.isTrue(bar_tearOff.call('foo'));
+    Expect.isFalse(bar_tearOff.call(1));
+    Expect.isTrue(bar_tearOff('foo'));
+  }
+
+  opt_arg([a = "a"]) => a is String;
+  var opt_arg_tearOff = opt_arg.call;
+
+  for (var i = 0; i < 20; i++) {
+    Expect.isFalse(opt_arg_tearOff(1));
+    Expect.isFalse(opt_arg_tearOff.call(1));
+    Expect.isTrue(opt_arg_tearOff());
+    Expect.isTrue(opt_arg_tearOff.call());
+    Expect.isTrue(opt_arg_tearOff("b"));
+    Expect.isTrue(opt_arg_tearOff.call("b"));
+  }
+
+  named_arg({x: 11, y: 22}) => "$x$y";
+  var named_arg_tearOff = named_arg.call;
+
+  for (var i = 0; i < 20; i++) {
+    Expect.equals("1122", named_arg_tearOff());
+    Expect.equals("1122", named_arg_tearOff.call());
+    Expect.equals("4455", named_arg_tearOff(y:55, x:44));
+    Expect.equals("4455", named_arg_tearOff.call(y:55, x:44));
+    Expect.equals("4455", named_arg_tearOff(x:44, y:55));
+    Expect.equals("4455", named_arg_tearOff.call(x:44, y:55));
+  }
+
+  Expect.throws(() => bar_tearOff.call(), (e) => e is NoSuchMethodError);
+  Expect.throws(() => opt_arg_tearOff.call(x:"p"), (e) => e is NoSuchMethodError);
+  Expect.throws(() => named_arg_tearOff.call("p", "q"), (e) => e is NoSuchMethodError);
+}