Add support for local variables(including parameters) to cps->js.

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';
 
 const String TEST_MAIN_FILE = 'test.dart';
 
 /// The list of tests to run.
 const List<String> RAW_TESTS = const [
   """
-  foo() { return 42; }
-  main() { return foo(); }
+foo(a) {
+  return a;
+}
+main() {
+  var a = 10;
+  var b = 1;
+  var t;
+  t = a;
+  a = b;
+  b = t;
+  print(a);
+  print(b);
+  print(b);
+  print(foo(a));
+}
+  """,
+  """
+foo() { return 42; }
+main() { return foo(); }
   """,
   "main() {}",
   "main() { return 42; }",
 ];
 
 String formatTest(Map test) {
   return test[TEST_MAIN_FILE];
 }
 
 main() {
   Expect.isTrue(const bool.fromEnvironment("USE_CPS_IR"));
 
   Iterable<Map> tests =
     RAW_TESTS.map((String text) => {TEST_MAIN_FILE: text});
 
   for (Map test in tests) {
     asyncTest(() {
       Compiler compiler = compilerFor(test);
       Uri uri = Uri.parse('memory:$TEST_MAIN_FILE');
       return compiler.run(uri).then((_) {
         Expect.isNotNull(compiler.assembledCode);
       }).catchError((e) {
         Expect.fail('The following test failed to compile:\n'
                     '${formatTest(test)}');
       });
     });
   }
 }