dart2js cps: Support async/await by rewriting the JavaScript AST.

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 152 matching lines @@
 [ $arch != ia32 && $arch != x64 && $arch != simarm && $arch != simarmv5te && $mode == debug ]
 verified_mem_test: Skip  # Not yet implemented.
 
 [ $runtime == vm && $mode == debug && $builder_tag == asan ]
 full_coverage_test: Skip  # Timeout.
 io/file_lock_test: Skip  # Timeout.
 io/test_runner_test: Skip  # Timeout.
 io/http_client_stays_alive_test: Skip  # Timeout.
 
 [ $compiler == dart2js && $cps_ir ]
-coverage_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/addlatexhash_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/file_error_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/file_read_encoded_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/file_test: Crash # (static testWriteFro...  cannot handle async/sync*/async* functions
-io/file_write_only_test: Crash # (main()async{asyncSt...  cannot handle async/sync*/async* functions
-io/http_bind_test: Crash # (testBindShared(Stri...  cannot handle async/sync*/async* functions
-io/http_client_connect_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/https_bad_certificate_test: Crash # (main()async{var cli...  cannot handle async/sync*/async* functions
-io/issue_22636_test: Crash # (test()async{server=...  cannot handle async/sync*/async* functions
-io/issue_22637_test: Crash # (test()async{server=...  cannot handle async/sync*/async* functions
-io/observatory_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/skipping_dart2js_compilations_test: Crash # (static Iterable<Str...  cannot handle async/sync*/async* functions
-io/socket_bind_test: Crash # (testListenCloseList...  cannot handle async/sync*/async* functions
-io/socket_source_address_test: Crash # (Future testConnect(...  cannot handle async/sync*/async* functions
+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 'any$1' of undefined