dart2js: Create noSuchMethod handlers at runtime to reduce overhead.

tests/language/invocation_mirror2_test.dart

Index: tests/language/invocation_mirror2_test.dart
diff --git a/tests/language/invocation_mirror2_test.dart b/tests/language/invocation_mirror2_test.dart
index de6fcc28c88f49a0fe6626f290e57db1c28d2bd0..fc8849a9ce61fceb4d43d0903222dad488b49cbd 100644
--- a/tests/language/invocation_mirror2_test.dart
+++ b/tests/language/invocation_mirror2_test.dart
@@ -2,6 +2,12 @@
 // 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.
 
+class GetName {
+  set flif(_) => "flif=";
+}
+
+static String getName(im) => im.invokeOn(new GetName());
+
 class C {
   var im;
   noSuchMethod(im) => this.im = im;
@@ -11,6 +17,6 @@ class C {
 main() {
  var c = new C();
  c.flif = 42;
- Expect.equals('flif=', c.im.memberName);
+ Expect.equals('flif=', getName(c.im));
  Expect.equals(42, c.im.positionalArguments[0]);
 }