Add tests for problem with newline encoding in multiline strings.

tests/language/multiline_newline_crlf.dart

Index: tests/language/multiline_newline_crlf.dart
diff --git a/tests/compiler/dart2js_extra/deferred_split_lib2.dart b/tests/language/multiline_newline_crlf.dart
similarity index 61%
copy from tests/compiler/dart2js_extra/deferred_split_lib2.dart
copy to tests/language/multiline_newline_crlf.dart
index d690e311ecee452f767aa8ea630e510b8c780bbc..64cd255a70d0630031e5b78eb8c0969dff4204c6 100644
--- a/tests/compiler/dart2js_extra/deferred_split_lib2.dart
+++ b/tests/language/multiline_newline_crlf.dart
@@ -1,9 +1,15 @@
-// Copyright (c) 2015, 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.
-
-// Deferred library loaded by deferred_split_test.dart
-
-import 'deferred_split_lib1.dart';
-
-createA() => new A();
+// Copyright (c) 2015, 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.
+
+library multiline_newline_crlf;
+
+const constantMultilineString = """
+a
+b
+""";
+
+var nonConstantMultilineString = """
+a
+b
+""";