[heap] Use CAS to update old to new slots in Scavenger.

[heap] Use CAS to update old to new slots in Scavenger.

BUG=chromium:676635
Review-Url: https://codereview.chromium.org/2628853002
Cr-Commit-Position: refs/heads/master@{#42227}
Committed: https://chromium.googlesource.com/v8/v8/+/fdff4b072ee15f8dbca60e86fdd4d054f034cb7f

[Hannes Payer (out of office), 2017-01-11 12:34:06]

The CQ bit was checked by hpayer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-11 12:34:16]

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

[ulan, 2017-01-11 12:48:04]

ulan@chromium.org changed reviewers:
+ ulan@chromium.org

[ulan, 2017-01-11 12:48:04]

lgtm

[commit-bot: I haz the power, 2017-01-11 13:02:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-01-11 13:02:07]

Dry run: This issue passed the CQ dry run.

[Hannes Payer (out of office), 2017-01-11 13:30:05]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2017-01-11 13:30:19]

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, 2017-01-11 13:32:14]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484141405823720, "parent_rev":
"3e362c755b1023dce1c2c7e4aad2a4bb5c5a5b70", "commit_rev":
"fdff4b072ee15f8dbca60e86fdd4d054f034cb7f"}

[commit-bot: I haz the power, 2017-01-11 13:32:17]

Description was changed from

==========
[heap] Use CAS to update old to new slots in Scavenger.

BUG=chromium:676635
==========

to

==========
[heap] Use CAS to update old to new slots in Scavenger.

BUG=chromium:676635

Review-Url: https://codereview.chromium.org/2628853002
Cr-Commit-Position: refs/heads/master@{#42227}
Committed:
https://chromium.googlesource.com/v8/v8/+/fdff4b072ee15f8dbca60e86fdd4d054f03...
==========

[commit-bot: I haz the power, 2017-01-11 13:32:18]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/fdff4b072ee15f8dbca60e86fdd4d054f03...