The shift-amount must not be anded with 31.

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 159 matching lines @@
 richards_test: Fail
 string_escape1_negative_test: Skip
 gc_test: Skip # Issue 1487
 
 [ $compiler == frog && $unchecked ]
 bool_test: Fail # Issue 2092
 compile_time_constant_c_test/01: Fail # integers as keys in literal maps.
 operator4_test: Fail
 
 [ $compiler == frog ]
+bit_shift_test: Fail # Frog copies JS semantics: 499 >> 33 !== 0.
 static_initializer_type_error_test: Fail # Checked mode not implemented.
 exception_test: Fail # Issue 1785
 factory3_test: Fail # Issue 417
 factory2_negative_test: Fail
 call_through_null_getter_test: Fail # Throw ObjectNotClosure instead of NullPointerException.
 compile_time_constant_c_test/02: Fail # string-concatenated (+) keys in literal maps.
 compile_time_constant_d_test: Fail # doesn't recognize 400 + z (with z parameter of constructor) as compile-time constant.
 compile_time_constant_e_test: Fail
 compile_time_constant_g_test: Fail # compile time constants with super calls to optional arguments.
 compile_time_constant_k_test: Fail # Constant maps are not canonicalized correctly if the same key appears multiple times.
@@ skipping 479 matching lines @@
 
 list_test: Fail, OK # Obsolete test uses List.copyFrom that was removed on 2011-10-31.
 
 final_syntax_test/none: Fail, OK # Uses deprecated "StrConstant + StrConstant".
 
 [ $compiler == dart2js && $mode == release ]
 assign_top_method_negative_test: Crash
 
 [ $compiler == dart2js && $runtime == none ]
 *: Fail, Pass # TODO(ahe): Triage these tests.