More MIPS status cleanup.

tests/standalone/standalone.status

 # Copyright (c) 2013, 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.
 
 # WARNING:
 # Tests using the multitest feature where failure is expected should *also* be
 # listed in tests/lib/analyzer/analyze_tests.status without the "standalone"
 # prefix.
 
 package/invalid_uri_test: Fail, OK # CompileTimeErrors intentionally
@@ skipping 124 matching lines @@
 oom_error_stacktrace_test: Pass # The test only fails at runtime.
 
 [ $compiler == dart2js && $browser ]
 *: Skip
 
 [ $arch == simarm || $arch == simarmv6 || $arch == simarmv5te || $arch == simmips ]
 out_of_memory_test: Skip # passes on Mac, crashes on Linux
 oom_error_stacktrace_test: Skip # Fails on Linux
 
 [ $arch == mips ]
-io/signals_test: Fail # Issue 17440
 io/file_stat_test: Fail # Issue 17440
 io/process_sync_test: Skip # Starts 10 dart subprocesses, uses too much memory.
 io/signals_test: Skip # Starts 10 dart subprocesses, uses too much memory
 io/socket_source_address_test: Fail # Issue 22597
 
 [ $arch == mips && $mode == debug ]
 io/web_socket_test: SkipSlow # Times out. Issue 20352
 io/test_runner_test: Skip # Flakily times out in a subtest. Issue 201351
 full_coverage_test: SkipSlow # Times out. Issue 20352
 io/http_client_stays_alive_test: Skip # Timing dependent test, MIPS machine too slow.
@@ skipping 134 matching lines @@
 # Following tests are skipped on dart_product as package mapping is not supported.
 [ $runtime == dart_product ]
 package/scenarios/packages_file_strange_formatting/mixed_line_ends_test: Skip
 package/scenarios/packages_file_strange_formatting/empty_lines_test: Skip
 package/scenarios/invalid/invalid_utf8_test: Skip
 package/scenarios/invalid/same_package_twice_test: Skip
 package/scenarios/invalid/non_existent_packages_file_test: Skip
 package/scenarios/empty_packages_file/empty_packages_file_noimports_test: Skip
 package/scenarios/packages_option_only/packages_option_only_noimports_test: Skip
 package/scenarios/packages_option_only/packages_option_only_test: Skip