Fixes the scope of case labels so that duplicate case labels are properly detected

tests/language/language.status

 # 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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on architectures other than the one you are working on.
@@ skipping 88 matching lines @@
 named_parameters_negative_test: Fail # Runtime only test, rewrite as multitest
 named_parameters_with_object_property_names_test: Fail # Issue 2137
 no_such_method_negative_test: Fail # Runtime only test, rewrite as multiteste
 override_field_test/03: Fail # still a valid test? Issue 3894
 override_field_test/04: Fail # still a valid test? Issue 3656
 private_member3_negative_test: Fail # Runtime only test?  rewrite as multitest
 pseudo_kw_illegal_test/08: Fail # Issue 356
 pseudo_kw_illegal_test/10: Fail # Issue 356
 pseudo_kw_illegal_test/14: Fail # Issue 356
 static_call_wrong_argument_count_negative_test: Fail # Runtime only test, rewrite as multitest
+switch5_negative_test: Fail    # Issue 3658
 switch7_negative_test: Fail    # Issue 3658
 switch_label_test: Fail        # Issue 3658
 syntax_test: Skip              # Bug 2107  Static type warnings in none case
 throw7_negative_test: Fail     # Issue 3654
 # try_catch_syntax_test/08: Fail # Issue 3795
 type_variable_bounds_test/00: Fail # issue 3079
 
 #
 # Add new dartc annotations above in alphabetical order
 #
@@ skipping 25 matching lines @@
 *: Skip
 
 [ $browser ]
 prefix_core_test: Fail # Issue 2264.
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == arm ]
 *: Skip