dart2js cps: Fuse tear-off and call invocation.

tests/compiler/dart2js/js_backend_cps_ir_closures_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.
 
 // Tests of closures.
 
 library closures_test;
 
 import 'js_backend_cps_ir.dart';
 
@@ skipping 88 matching lines @@
   b() => () => a();
 }
 main() {
   print(new A().b()());
 }
 """,
 r"""
 function() {
   return new V.A_b_closure(this);
 }"""),
+
+  const TestEntry("""
+staticMethod(x) => x;
+main(x) {
+  var tearOff = staticMethod;
+  print(tearOff(123));
+}
+""",
+r"""
+function(x) {
+  P.print(V.staticMethod(123));
+}"""),
+
+  const TestEntry("""
+class Foo {
+  instanceMethod(x) => x;
+}
+main(x) {
+  var tearOff = new Foo().instanceMethod;
+  print(tearOff(123));
+}
+""",
+r"""
+function(x) {
+  P.print(V.Foo$().instanceMethod$1(123));
+}"""),
 ];
 
 void main() {
   runTests(tests);
 }