Make priority_queue_stress_test pass analyzer.

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 42 matching lines @@
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 javascript_int_overflow_literal_test/01: Fail, OK
 issue14236_test: Skip # Analyzer can't handle Script snapshots.
 
 # test issue https://code.google.com/p/dart/issues/detail?id=11518
 io/file_constructor_test: fail
 
 # This is runtime test.
 io/process_exit_negative_test: Skip
 
-priority_queue_stress_test: StaticWarning # Issue 21468
-
 [ $compiler == dart2js ]
 number_identity_test: Skip # Bigints and int/double diff. not supported.
 typed_data_test: Skip # dart:typed_data support needed.
 bytedata_test: Skip # dart:typed_data support needed.
 typed_data_view_test: Skip # dart:typed_data support needed.
 typed_data_isolate_test: Skip # dart:typed_data support needed.
 typed_array_int64_uint64_test: Skip # dart:typed_data on dart2js does not support 64-bit ints.
 float_array_test: Skip # dart:typed_data support needed.
 int_array_test: Skip  # dart:typed_data support needed.
 io/web_socket_protocol_processor_test: Skip  # Importing code with external keyword
@@ skipping 80 matching lines @@
 [ $compiler == dart2analyzer ]
 package/package1_test: CompileTimeError
 package/package_test: CompileTimeError
 
 [ $system == windows ]
 io/skipping_dart2js_compilations_test: Fail # Issue 19551.
 
 [ $system != linux ]
 io/server_socket_reference_issue21383_and_issue21384_test: Skip # Not supported on other platforms so far