[heap] reorder root list items.

[heap] reorder root list items.

- Moves the most often used 32 items to the top. This shaves off 10kB
  from the startup snapshot size.
- Sorts the rest by usage and type.

R=mlippautz@chromium.org

Committed: https://crrev.com/55b21249685fa86f8972a4023f1d3e9ff6fe6a09
Cr-Commit-Position: refs/heads/master@{#37176}

[Michael Lippautz, 2016-06-22 08:31:24]

lgtm

[Yang, 2016-06-22 08:44:44]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2016-06-22 08:44:51]

The CQ bit was unchecked by yangguo@chromium.org

[Yang, 2016-06-22 09:00:43]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2016-06-22 09:00:44]

The patchset sent to the CQ was uploaded after l-g-t-m from
mlippautz@chromium.org
Link to the patchset: https://codereview.chromium.org/2088023003/#ps20001
(title: "remove unrelated change")

[commit-bot: I haz the power, 2016-06-22 09:00:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2088023003/20001

[commit-bot: I haz the power, 2016-06-22 09:29:25]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-22 09:31:08]

Description was changed from

==========
[heap] reorder root list items.

- Moves the most often used 32 items to the top. This shaves off 10kB
  from the startup snapshot size.
- Sorts the rest by usage and type.

R=mlippautz@chromium.org
==========

to

==========
[heap] reorder root list items.

- Moves the most often used 32 items to the top. This shaves off 10kB
  from the startup snapshot size.
- Sorts the rest by usage and type.

R=mlippautz@chromium.org

Committed: https://crrev.com/55b21249685fa86f8972a4023f1d3e9ff6fe6a09
Cr-Commit-Position: refs/heads/master@{#37176}
==========

[commit-bot: I haz the power, 2016-06-22 09:31:11]

Patchset 2 (id:??) landed as
https://crrev.com/55b21249685fa86f8972a4023f1d3e9ff6fe6a09
Cr-Commit-Position: refs/heads/master@{#37176}