Split js_backend_cps_ir tests into multiple test units.

tests/compiler/dart2js/js_backend_cps_ir_basic_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
 
 // Tests for basic functionality.
 
 library basic_tests;
 
-import 'js_backend_cps_ir_test.dart';
+import 'js_backend_cps_ir.dart';
 
 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);
@@ skipping 74 matching lines @@
   // Method invocation
   const TestEntry("""
 main() {
   print(new DateTime.now().isBefore(new DateTime.now()));
 }""", r"""
 function() {
   P.print(P.DateTime$now().isBefore$1(P.DateTime$now()));
   return null;
 }"""),
 ];
+
+
+void main() {
+  runTests(tests);
+}