Split js_backend_cps_ir tests into multiple test units.

tests/compiler/dart2js/js_backend_cps_ir_operators.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 operators.
-
-library operators_tests;
-
-import 'js_backend_cps_ir_test.dart';
-
-const List<TestEntry> tests = const [
-  const TestEntry("main() { return true ? 42 : 'foo'; }"),
-  const TestEntry("""
-foo() => foo();
-main() {
-  print(foo() ? "hello world" : "bad bad");
-}""",
-"""function() {
-  P.print(P.identical(V.foo(), true) ? "hello world" : "bad bad");
-  return null;
-}"""),
-  const TestEntry("""
-get foo => foo;
-main() {
-  print(foo ? "hello world" : "bad bad");
-}""",
-"""function() {
-  P.print(P.identical(V.foo(), true) ? "hello world" : "bad bad");
-  return null;
-}"""),
-  const TestEntry("""
-get foo => foo;
-main() { print(foo && foo); }""",
-"""function() {
-  P.print(P.identical(V.foo(), true) && P.identical(V.foo(), true));
-  return null;
-}"""),
-  const TestEntry("""
-get foo => foo;
-main() { print(foo || foo); }""",
-"""function() {
-  P.print(P.identical(V.foo(), true) || P.identical(V.foo(), true));
-  return null;
-}"""),
-];