Migrated test block 24 to Dart 2.0.

tests/corelib_2/regexp/regress-regexp-codeflush_test.dart

Index: tests/corelib_2/regexp/regress-regexp-codeflush_test.dart
diff --git a/tests/corelib_strong/regexp/regress-regexp-codeflush_test.dart b/tests/corelib_2/regexp/regress-regexp-codeflush_test.dart
similarity index 99%
rename from tests/corelib_strong/regexp/regress-regexp-codeflush_test.dart
rename to tests/corelib_2/regexp/regress-regexp-codeflush_test.dart
index 03b0804e1dd24a26c840d5ee9791a9e02f71afd4..5acf38fc912d740ad4775843316fab97bef667ba 100644
--- a/tests/corelib_strong/regexp/regress-regexp-codeflush_test.dart
+++ b/tests/corelib_2/regexp/regress-regexp-codeflush_test.dart
@@ -40,7 +40,7 @@ void main() {
 
   var re = new RegExp('(s)');
 
-  dynamic foo(Match m) {
+  String foo(Match m) {
     return "42";
   }