Revert two Kernel changes that were causing test failures.

tests/language_2/assert_with_type_test_or_cast_test.dart

Index: tests/language_2/assert_with_type_test_or_cast_test.dart
diff --git a/tests/language_2/assert_with_type_test_or_cast_test.dart b/tests/language_2/assert_with_type_test_or_cast_test.dart
deleted file mode 100644
index 85a18ec9d6b2b7ff63e47e86caa47c2882d2c11b..0000000000000000000000000000000000000000
--- a/tests/language_2/assert_with_type_test_or_cast_test.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2012, 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.
-
-// Issue 3741: generic type tests and casts fail in assertion statements
-// when run in production mode.
-//
-// The cause was incomplete generic type skipping, so each of the assert
-// statements below would fail.
-//
-// VMOptions=
-// VMOptions=--enable_asserts
-
-main() {
-  var names = new List<int>();
-
-  // Generic type test.
-  assert(names is List<int>);
-
-  // Negated generic type test.
-  assert(names is! List<String>);
-
-  // Generic type cast.
-  assert((names as List<num>).length == 0);
-
-  // Generic type test inside expression.
-  assert((names is List<int>));
-}