Compute frontend/backend specific constants.

tests/language/const_switch2_test.dart

Index: tests/language/const_switch2_test.dart
diff --git a/tests/compiler/dart2js/path with spaces/file with spaces.dart b/tests/language/const_switch2_test.dart
similarity index 50%
copy from tests/compiler/dart2js/path with spaces/file with spaces.dart
copy to tests/language/const_switch2_test.dart
index b0cc20402f823946fa54730f2bb581c9bf58365a..73728999353c1586d45a293b29d14a5b8744d86c 100644
--- a/tests/compiler/dart2js/path with spaces/file with spaces.dart	
+++ b/tests/language/const_switch2_test.dart
@@ -2,8 +2,14 @@
 // 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.
 
-import 'library space/lib with spaces.dart';
+import 'package:expect/expect.dart';
 
-main() {
-  if (foo() != 499) throw "bad value";
-}
+int main() {
+  var a = [1,2,3][2];
+  switch (a) {
+    case 0.0:            /// 01: compile-time error
+      print("illegal");  /// 01: continued
+    case 1:
+      print("OK");
+  }
+}