[heap] Fix helping sweeping for parallel compaction spaces

[heap] Fix helping sweeping for parallel compaction spaces

R=hpayer@chromium.org
BUG=chromium:524425
LOG=N

Committed: https://crrev.com/8789eca0fb16e196d0c8dd0f8f6a162238c13a2d
Cr-Commit-Position: refs/heads/master@{#31724}

[Michael Lippautz, 2015-11-02 22:27:00]

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

[commit-bot: I haz the power, 2015-11-02 22:27:04]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413223011/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413223011/1

[Hannes Payer (out of office), 2015-11-02 22:29:06]

lgtm

[commit-bot: I haz the power, 2015-11-02 22:42:52]

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

[commit-bot: I haz the power, 2015-11-02 22:42:53]

Dry run: Try jobs failed on following builders:
  v8_linux_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel/builds/11283)
  v8_win64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win64_rel/builds/10317)

[Michael Lippautz, 2015-11-02 22:49:08]

Patchset #2 (id:20001) has been deleted

[Michael Lippautz, 2015-11-02 22:49:45]

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

[commit-bot: I haz the power, 2015-11-02 22:49:52]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413223011/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413223011/40001

[commit-bot: I haz the power, 2015-11-02 23:35:21]

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

[commit-bot: I haz the power, 2015-11-02 23:35:22]

Dry run: This issue passed the CQ dry run.

[Michael Lippautz, 2015-11-02 23:36:53]

The CQ bit was checked by mlippautz@chromium.org

[Michael Lippautz, 2015-11-02 23:36:53]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/1413223011/#ps40001
(title: "Remove DCHECK ensuring consistency in single-threaded use cases")

[commit-bot: I haz the power, 2015-11-02 23:37:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413223011/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413223011/40001

[commit-bot: I haz the power, 2015-11-02 23:38:27]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-11-02 23:38:40]

Patchset 2 (id:??) landed as
https://crrev.com/8789eca0fb16e196d0c8dd0f8f6a162238c13a2d
Cr-Commit-Position: refs/heads/master@{#31724}