Add corelib tests

test/codegen/corelib/string_from_environment2_test.dart

Index: test/codegen/corelib/string_from_environment2_test.dart
diff --git a/test/codegen/language/call_argument_inference_test.dart b/test/codegen/corelib/string_from_environment2_test.dart
similarity index 52%
copy from test/codegen/language/call_argument_inference_test.dart
copy to test/codegen/corelib/string_from_environment2_test.dart
index 0af5537d58ddb8eacad9f37bbbb5e0adc8295f3c..b6d81b816d7499b03d86c19ffb369382f3afe83f 100644
--- a/test/codegen/language/call_argument_inference_test.dart
+++ b/test/codegen/corelib/string_from_environment2_test.dart
@@ -1,14 +1,12 @@
 // Copyright (c) 2013, 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.
+// SharedOptions=-Da=a -Da=bb -Db=bb -Dc=ccc -Da=ccc -Db=ccc
 
 import "package:expect/expect.dart";
 
-class A {
-  call(a) => a is num;
-}
-
 main() {
-  Expect.isTrue(new A().call(42));
-  Expect.isFalse(new A()('foo'));
+  Expect.equals('ccc', const String.fromEnvironment('a'));
+  Expect.equals('ccc', const String.fromEnvironment('b'));
+  Expect.equals('ccc', const String.fromEnvironment('c'));
 }