Add regression tests.

test/kernel/regression/issue_000045.dart

Index: test/kernel/regression/issue_000045.dart
diff --git a/test/kernel/regression/issue_000033.dart b/test/kernel/regression/issue_000045.dart
similarity index 92%
copy from test/kernel/regression/issue_000033.dart
copy to test/kernel/regression/issue_000045.dart
index cf8392bf21615edd1992f8ad034d463cc12882f4..f8c7e61d7b7b30e3dd5e3f2f0c3513dd850dff00 100644
--- a/test/kernel/regression/issue_000033.dart
+++ b/test/kernel/regression/issue_000045.dart
@@ -2,6 +2,4 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
-@JS()
-main() {
-}
+main() => """${1}