dart2js cps: Remove code after calls that cannot return.

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 180 matching lines @@
 
 [ $runtime == vm ]
 # Failures in secure networking while NSS is replaced with BoringSSL
 io/https_client_certificate_test: RuntimeError # Issue 24070
 io/secure_server_client_certificate_test: RuntimeError # Issue 24069
 io/secure_server_client_no_certificate_test: RuntimeError # Issue 24069
 io/secure_socket_renegotiate_test: RuntimeError
 io/secure_socket_bad_data_test: RuntimeError  # An error in a secure connection just puts a READ_CLOSED on the stream, rather than signaling an error on the stream.
 
 [ $compiler == dart2js && $cps_ir ]
-coverage_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
-io/addlatexhash_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_error_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_read_encoded_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/http_client_connect_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/observatory_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/skipping_dart2js_compilations_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 priority_queue_stress_test: RuntimeError # Cannot read property 'length' of undefined