Reland of Ship async functions

Reland of Ship async functions (patchset #1 id:1 of https://codereview.chromium.org/2364963003/ )

Reason for revert:
Fixed underlying cause of TSAN issue; trying again while watching the bots.

Original issue's description:
> Revert of Ship async functions (patchset #2 id:20001 of https://codereview.chromium.org/2356943002/ )
>
> Reason for revert:
> Triggers TSAN errors on Linux64:
>
> https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/11901
>
> Original issue's description:
> > Ship async functions
> >
> > Intent to ship discussion:
> > https://groups.google.com/forum/#!topic/v8-users/gwpcEIrgIZY
> >
> > BUG=v8:4483
> >
> > Committed: https://crrev.com/9f7540a0ec6333e7c71615609fe29274d9b7a4c5
> > Cr-Commit-Position: refs/heads/master@{#39697}
>
> TBR=caitp@igalia.com,littledan@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:4483
>
> Committed: https://crrev.com/a4354b6c15fd9dbde2677efdf81fbc99ff0cf3e0
> Cr-Commit-Position: refs/heads/master@{#39699}

TBR=caitp@igalia.com,adamk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4483
Committed: https://crrev.com/97cdf9f978e971df8a463fef7525bb942d305796
Cr-Commit-Position: refs/heads/master@{#39702}

[Dan Ehrenberg, 2016-09-24 02:08:33]

The CQ bit was checked by littledan@chromium.org

[Dan Ehrenberg, 2016-09-24 02:08:33]

Created Reland of Ship async functions

[commit-bot: I haz the power, 2016-09-24 02:08:38]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-24 02:08:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-24 02:09:01]

Description was changed from

==========
Reland of Ship async functions (patchset #1 id:1 of
https://codereview.chromium.org/2364963003/ )

Reason for revert:
Fixed underlying cause of TSAN issue; trying again while watching the bots.

Original issue's description:
> Revert of Ship async functions (patchset #2 id:20001 of
https://codereview.chromium.org/2356943002/ )
> 
> Reason for revert:
> Triggers TSAN errors on Linux64:
> 
>
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/11901
> 
> Original issue's description:
> > Ship async functions
> >
> > Intent to ship discussion:
> > https://groups.google.com/forum/#!topic/v8-users/gwpcEIrgIZY
> >
> > BUG=v8:4483
> >
> > Committed: https://crrev.com/9f7540a0ec6333e7c71615609fe29274d9b7a4c5
> > Cr-Commit-Position: refs/heads/master@{#39697}
> 
> TBR=caitp@igalia.com,littledan@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:4483
> 
> Committed: https://crrev.com/a4354b6c15fd9dbde2677efdf81fbc99ff0cf3e0
> Cr-Commit-Position: refs/heads/master@{#39699}

TBR=caitp@igalia.com,adamk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4483
==========

to

==========
Reland of Ship async functions (patchset #1 id:1 of
https://codereview.chromium.org/2364963003/ )

Reason for revert:
Fixed underlying cause of TSAN issue; trying again while watching the bots.

Original issue's description:
> Revert of Ship async functions (patchset #2 id:20001 of
https://codereview.chromium.org/2356943002/ )
>
> Reason for revert:
> Triggers TSAN errors on Linux64:
>
>
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/11901
>
> Original issue's description:
> > Ship async functions
> >
> > Intent to ship discussion:
> > https://groups.google.com/forum/#!topic/v8-users/gwpcEIrgIZY
> >
> > BUG=v8:4483
> >
> > Committed: https://crrev.com/9f7540a0ec6333e7c71615609fe29274d9b7a4c5
> > Cr-Commit-Position: refs/heads/master@{#39697}
>
> TBR=caitp@igalia.com,littledan@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:4483
>
> Committed: https://crrev.com/a4354b6c15fd9dbde2677efdf81fbc99ff0cf3e0
> Cr-Commit-Position: refs/heads/master@{#39699}

TBR=caitp@igalia.com,adamk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4483

Committed: https://crrev.com/97cdf9f978e971df8a463fef7525bb942d305796
Cr-Commit-Position: refs/heads/master@{#39702}
==========

[commit-bot: I haz the power, 2016-09-24 02:09:02]

Patchset 1 (id:??) landed as
https://crrev.com/97cdf9f978e971df8a463fef7525bb942d305796
Cr-Commit-Position: refs/heads/master@{#39702}

[Dan Ehrenberg, 2016-09-24 02:50:05]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2365113003/ by littledan@chromium.org.

The reason for reverting is: TSAN failures still happening; need to investigate
more..