[heap] Fix clearing slots for map and size during LeftTrimFixedArray

[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N

Committed: https://crrev.com/5aa1d9c3cfde4389fb5a34e98a5dccbca9dc9f12
Cr-Commit-Position: refs/heads/master@{#35970}

[Michael Lippautz, 2016-05-03 09:58:18]

Description was changed from

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=
==========

to

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N
==========

[Michael Lippautz, 2016-05-03 10:00:30]

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

[Michael Lippautz, 2016-05-03 10:00:31]

Ulan: PTAL

Camillo/Jakob: FYI, this should fix the IsValidSlot() issue in the bug.
Unfortunately this should be just a debugging issue.

[ulan, 2016-05-03 10:01:02]

lgtm, thanks for fixing!

[Michael Lippautz, 2016-05-03 10:04:44]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2016-05-03 10:04:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1943263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1943263002/1

[commit-bot: I haz the power, 2016-05-03 10:26:39]

Description was changed from

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N
==========

to

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N
==========

[commit-bot: I haz the power, 2016-05-03 10:26:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-03 10:27:34]

Description was changed from

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N
==========

to

==========
[heap] Fix clearing slots for map and size during LeftTrimFixedArray

BUG=chromium:598319
LOG=N

Committed: https://crrev.com/5aa1d9c3cfde4389fb5a34e98a5dccbca9dc9f12
Cr-Commit-Position: refs/heads/master@{#35970}
==========

[commit-bot: I haz the power, 2016-05-03 10:27:35]

Patchset 1 (id:??) landed as
https://crrev.com/5aa1d9c3cfde4389fb5a34e98a5dccbca9dc9f12
Cr-Commit-Position: refs/heads/master@{#35970}

[Yang, 2016-05-03 13:04:55]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1947473002/ by yangguo@chromium.org.

The reason for reverting is: GC-stress failures:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/....