[heap] reorder empty scope info in the root list.

[heap] reorder empty scope info in the root list.

Apparently the previous clean up has regressed performance in some
cases. This is an attempt to recover these regressions.

R=ulan@chromium.org
BUG=chromium:661567
Committed: https://crrev.com/e3f2910da7cbe509045de0fd2ce2768ba3c078a1
Cr-Commit-Position: refs/heads/master@{#40707}

[Yang, 2016-11-02 13:49:20]

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

[commit-bot: I haz the power, 2016-11-02 13:49:31]

Dry run: 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, 2016-11-02 14:16:04]

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

[commit-bot: I haz the power, 2016-11-02 14:16:05]

Dry run: This issue passed the CQ dry run.

[ulan, 2016-11-02 14:30:16]

lgtm

[Yang, 2016-11-02 15:16:56]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2016-11-02 15:17:02]

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, 2016-11-02 15:19:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:19:43]

Description was changed from

==========
[heap] reorder empty scope info in the root list.

Apparently the previous clean up has regressed performance in some
cases. This is an attempt to recover these regressions.

R=ulan@chromium.org
BUG=chromium:661567
==========

to

==========
[heap] reorder empty scope info in the root list.

Apparently the previous clean up has regressed performance in some
cases. This is an attempt to recover these regressions.

R=ulan@chromium.org
BUG=chromium:661567

Committed: https://crrev.com/e3f2910da7cbe509045de0fd2ce2768ba3c078a1
Cr-Commit-Position: refs/heads/master@{#40707}
==========

[commit-bot: I haz the power, 2016-11-17 22:19:44]

Patchset 1 (id:??) landed as
https://crrev.com/e3f2910da7cbe509045de0fd2ce2768ba3c078a1
Cr-Commit-Position: refs/heads/master@{#40707}