test rename overhaul: step 8 - language tests

tests/language/src/ExceptionIdentityTest.dart

-// Copyright (c) 2011, 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.
-
-// Test that an object when thrown stays the same.
-
-class A {
-  A();
-}
-
-check(exception) {
-  try {
-    throw exception;
-  } catch (var e) {
-    Expect.equals(exception, e);
-  }
-}
-
-main() {
-  check("str");
-  check(new A());
-  check(1);
-  check(1.2);
-}