Make bit-operations return a positive result.

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 173 matching lines @@
 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.
 compile_time_constant_l_test: Fail # final instance fields with default values are not initialized correctly.
 compile_time_constant_o_test: Fail # String constants with string-interpolation.
 compile_time_constant_p_test/01: Fail # Implicit super calls that don't match are not caught in compile-time constants.
+positive_bit_operations_test: Fail # Frog goes negative.
 disable_privacy_test: Skip  # Issue 1882: Needs --disable_privacy support.
 double_to_string_as_exponential_test: Fail # fails due to -0.0.
 # Once the -0.0 in double_to_string_as_fixed_test is fixed it will probably need to
 # be moved to a
 # [ $compiler == frog ]
 # section.
 double_to_string_as_fixed_test: Fail # fails due to -0.0 and due to rounding in constant propagation.
 double_to_string_as_precision_test: Fail # fails due to -0.0.
 extend_type_parameter_negative_test: Skip # Issue 886
 extend_type_parameter2_negative_test: Skip # Issue 886
@@ skipping 450 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.