Don't delay values and errors from async/await functions.

Don't delay values and errors from async/await functions.

Fixes issue 23497.

R=hausner@google.com

Committed: https://github.com/dart-lang/sdk/commit/f2d08149fdeb5e67db1b3b4e4284cbac5a83169c

[floitsch, 2015-08-11 18:17:59]

floitsch@google.com changed reviewers:
+ hausner@google.com, lrn@google.com

[floitsch, 2015-08-11 18:17:59]

We are allowed to use a sync-completer, since we only call the complete
functions in tail-position of an asynchronous callback.

[hausner, 2015-08-12 00:01:03]

lgtm

https://codereview.chromium.org/1287673002/diff/1/runtime/vm/parser.cc
File runtime/vm/parser.cc (right):

https://codereview.chromium.org/1287673002/diff/1/runtime/vm/parser.cc#newcod...
runtime/vm/parser.cc:7031: //   :async_completer = new Completer();
This comment should now say Completer.sync()

[floitsch, 2015-08-12 14:19:47]

Forgot to add the test.
Will commit already, but if you have comments on the test, let me know and I
will create a follow-up CL.

https://codereview.chromium.org/1287673002/diff/1/runtime/vm/parser.cc
File runtime/vm/parser.cc (right):

https://codereview.chromium.org/1287673002/diff/1/runtime/vm/parser.cc#newcod...
runtime/vm/parser.cc:7031: //   :async_completer = new Completer();
On 2015/08/12 00:01:03, hausner wrote:
> This comment should now say Completer.sync()

Done.

[floitsch, 2015-08-13 11:00:15]

Committed patchset #3 (id:40001) manually as
f2d08149fdeb5e67db1b3b4e4284cbac5a83169c (presubmit successful).