[field type tracking] Fix handling of cleared WeakCells.

[field type tracking] Fix handling of cleared WeakCells.

BUG=chromium:514080, chromium:527994, v8:4325
LOG=N

Committed: https://crrev.com/debf2adcdfcdbb6402fa97d225a29a28a0dbc665
Cr-Commit-Position: refs/heads/master@{#32871}

[Igor Sheludko, 2015-12-15 14:15:43]

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

[commit-bot: I haz the power, 2015-12-15 14:15:46]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1522413002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1522413002/1

[Igor Sheludko, 2015-12-15 14:15:55]

ishell@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Igor Sheludko, 2015-12-15 14:15:56]

PTAL

[Jakob Kummerow, 2015-12-15 14:31:23]

lgtm

[commit-bot: I haz the power, 2015-12-15 14:45:59]

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

[commit-bot: I haz the power, 2015-12-15 14:46:00]

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/13117)

[Igor Sheludko, 2015-12-15 14:46:17]

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

[commit-bot: I haz the power, 2015-12-15 14:46:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1522413002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1522413002/20001

[commit-bot: I haz the power, 2015-12-15 15:05:23]

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

[commit-bot: I haz the power, 2015-12-15 15:05:23]

Dry run: This issue passed the CQ dry run.

[Igor Sheludko, 2015-12-15 15:42:32]

The CQ bit was checked by ishell@chromium.org

[Igor Sheludko, 2015-12-15 15:42:32]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1522413002/#ps20001
(title: "Fix")

[commit-bot: I haz the power, 2015-12-15 15:42:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1522413002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1522413002/20001

[commit-bot: I haz the power, 2015-12-15 15:43:49]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-12-15 15:43:59]

Description was changed from

==========
[field type tracking] Fix handling of cleared WeakCells.

BUG=chromium:514080,chromium:527994,v8:4325
LOG=N
==========

to

==========
[field type tracking] Fix handling of cleared WeakCells.

BUG=chromium:514080,chromium:527994,v8:4325
LOG=N

Committed: https://crrev.com/debf2adcdfcdbb6402fa97d225a29a28a0dbc665
Cr-Commit-Position: refs/heads/master@{#32871}
==========

[commit-bot: I haz the power, 2015-12-15 15:44:00]

Patchset 2 (id:??) landed as
https://crrev.com/debf2adcdfcdbb6402fa97d225a29a28a0dbc665
Cr-Commit-Position: refs/heads/master@{#32871}