Split js_backend_cps_ir tests into multiple test units.

tests/compiler/dart2js/js_backend_cps_ir_control_flow_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_control_flow_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_control_flow.dart b/tests/compiler/dart2js/js_backend_cps_ir_control_flow_test.dart
similarity index 95%
rename from tests/compiler/dart2js/js_backend_cps_ir_control_flow.dart
rename to tests/compiler/dart2js/js_backend_cps_ir_control_flow_test.dart
index 2695588a82560ce4dafae22a62b64594f1e16dc3..9f82e28ac05ea3d17dc3ebb19a2162621b28b9fa 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_control_flow.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_control_flow_test.dart
@@ -1,12 +1,13 @@
 // 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 of control flow statements.
 
 library control_flow_tests;
 
-import 'js_backend_cps_ir_test.dart';
+import 'js_backend_cps_ir.dart';
 
 const List<TestEntry> tests = const [
   const TestEntry("""
@@ -138,3 +139,7 @@ function() {
   return null;
 }"""),
 ];
+
+void main() {
+  runTests(tests);
+}