Run async immediately in dart2js and VM.

Run async immediately in dart2js and VM.

[floitsch, 2017-08-16 11:56:32]

Description was changed from

==========
Run async immediately in dart2js.
==========

to

==========
Run async immediately in dart2js and VM.
==========

[Vyacheslav Egorov (Google), 2017-08-21 16:15:36]

vegorov@google.com changed reviewers:
+ vegorov@google.com

[Vyacheslav Egorov (Google), 2017-08-21 16:15:37]

This CL also needs to update Kernel async transform.

[asandholm, 2017-08-24 16:56:54]

On 2017/08/21 16:15:37, Vyacheslav Egorov (Google) wrote:
> This CL also needs to update Kernel async transform.

Also wondering, what about changes to DDC?

[sra1, 2017-08-24 17:21:17]

sra@google.com changed reviewers:
+ sra@google.com

[sra1, 2017-08-24 17:21:18]

https://codereview.chromium.org/2478703003/diff/20001/pkg/compiler/lib/src/co...
File pkg/compiler/lib/src/common_elements.dart (right):

https://codereview.chromium.org/2478703003/diff/20001/pkg/compiler/lib/src/co...
pkg/compiler/lib/src/common_elements.dart:550:
_env.lookupConstructor(_findAsyncHelperClass("_AsyncAwaitCompleter"), "");
This is confusing. Why is the 'sync' getter returning an '_Async' method?

https://codereview.chromium.org/2478703003/diff/20001/sdk/lib/_internal/js_ru...
File sdk/lib/_internal/js_runtime/lib/async_patch.dart (right):

https://codereview.chromium.org/2478703003/diff/20001/sdk/lib/_internal/js_ru...
sdk/lib/_internal/js_runtime/lib/async_patch.dart:173: // Can't happen. Just
here to make the class known to the compiler.
This should be done properly through the impact system.

[floitsch, 2017-09-12 14:00:47]

Migrated to https://dart-review.googlesource.com/c/sdk/+/5263