Handle named and optional arguments in cps-ir.

tests/compiler/dart2js/js_backend_cps_ir_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=-DUSE_CPS_IR=true
 
 // Test that the CPS IR code generator is able to compile the provided
 // example programs.
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/apiimpl.dart'
        show Compiler;
 import 'memory_compiler.dart';
 import 'package:compiler/src/js/js.dart' as js;
 import 'package:compiler/src/common.dart' show Element;
 
 
 const String TEST_MAIN_FILE = 'test.dart';
 
 class TestEntry {
   final String source;
   final String expectation;
   const TestEntry(this.source, [this.expectation]);
 }
 
 /// The list of tests to run.
 const List<TestEntry> tests = const [
+  const TestEntry("""
+foo(a, [b = "b"]) => b;
+bar(a, {b: "b", c: "c"}) => c;
+main() {
+  foo(0);
+  foo(0, 1);
+  bar(0);
+  bar(0, b: 1);
+  bar(0, c: 1);
+  bar(0, b: 1, c: 2);
+}
+""",
+"""
+function() {
+  V.foo(0, "b");
+  V.foo(0, 1);
+  V.bar(0, "b", "c");
+  V.bar(0, 1, "c");
+  V.bar(0, "b", 1);
+  V.bar(0, 1, 2);
+  return null;
+}"""),
   const TestEntry(
   """
 foo(a) {
   return a;
 }
 main() {
   var a = 10;
   var b = 1;
   var t;
   t = a;
@@ skipping 57 matching lines @@
           Expect.equals(test.expectation, getCodeForMain(compiler));
         }
       }).catchError((e) {
         print(e);
         Expect.fail('The following test failed to compile:\n'
                     '${formatTest(files)}');
       });
     });
   }
 }