[heap] Unconditionally mark objects that undergo unsafe layout changes.

[heap] Unconditionally mark objects that undergo unsafe layout changes.

In the upcoming concurrent marking protocol the main thread will have to
mark objects before performing unsafe layout change.

This patch is an experiment for evaluating memory the impact of marking
an object on layout change.

BUG=chromium:694255
Review-Url: https://codereview.chromium.org/2706213002
Cr-Commit-Position: refs/heads/master@{#43351}
Committed: https://chromium.googlesource.com/v8/v8/+/fa5304d1aad94d08fcc17c22e9ec03bf7ea4c295

[ulan, 2017-02-21 11:37:55]

Description was changed from

==========
[heap] Unconditionally mark objects that undergo unsafe layout changes.

In the upcoming concurrent marking protocol the main thread will have to
mark objects before performing unsafe layout change.

This patch is an experiment for evaluating memory impact of marking
the object on layout change.

BUG=chromium:694255
==========

to

==========
[heap] Unconditionally mark objects that undergo unsafe layout changes.

In the upcoming concurrent marking protocol the main thread will have to
mark objects before performing unsafe layout change.

This patch is an experiment for evaluating memory the impact of marking
an object on layout change.

BUG=chromium:694255
==========

[ulan, 2017-02-21 12:00:32]

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

[ulan, 2017-02-21 12:00:32]

ptal

[Michael Lippautz, 2017-02-21 17:31:42]

lgtm

[ulan, 2017-02-21 17:34:32]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2017-02-21 17:34:40]

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, 2017-02-21 17:58:37]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487698472873100, "parent_rev":
"caa1d4b262d2e97ce3b9f4163de46f230a8a9929", "commit_rev":
"fa5304d1aad94d08fcc17c22e9ec03bf7ea4c295"}

[commit-bot: I haz the power, 2017-02-21 17:58:41]

Description was changed from

==========
[heap] Unconditionally mark objects that undergo unsafe layout changes.

In the upcoming concurrent marking protocol the main thread will have to
mark objects before performing unsafe layout change.

This patch is an experiment for evaluating memory the impact of marking
an object on layout change.

BUG=chromium:694255
==========

to

==========
[heap] Unconditionally mark objects that undergo unsafe layout changes.

In the upcoming concurrent marking protocol the main thread will have to
mark objects before performing unsafe layout change.

This patch is an experiment for evaluating memory the impact of marking
an object on layout change.

BUG=chromium:694255

Review-Url: https://codereview.chromium.org/2706213002
Cr-Commit-Position: refs/heads/master@{#43351}
Committed:
https://chromium.googlesource.com/v8/v8/+/fa5304d1aad94d08fcc17c22e9ec03bf7ea...
==========

[commit-bot: I haz the power, 2017-02-21 17:58:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/fa5304d1aad94d08fcc17c22e9ec03bf7ea...