[heap] Reland: Use store buffer for writes coming from mutator.

[heap] Reland: Use store buffer for writes coming from mutator.

This reverts commit 810fcb2866d265266b24515ff2d9348425c63aef.

BUG=chromium:648568, chromium:669270
Committed: https://crrev.com/f3d119b9c5bb39ba994a6e437bfdacff9a6ff8fc
Cr-Commit-Position: refs/heads/master@{#41350}

[Hannes Payer (out of office), 2016-11-29 10:17:50]

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

[commit-bot: I haz the power, 2016-11-29 10:18:03]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Michael Lippautz, 2016-11-29 10:19:29]

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

[Michael Lippautz, 2016-11-29 10:19:29]

lgtm

[commit-bot: I haz the power, 2016-11-29 10:54:48]

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

[commit-bot: I haz the power, 2016-11-29 10:54:49]

Dry run: This issue passed the CQ dry run.

[Hannes Payer (out of office), 2016-11-29 11:53:49]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2016-11-29 11:53:53]

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, 2016-11-29 11:55:51]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1480420429675180,
"parent_rev": "7e023c5ae1a81dd5906d554cfe3306a29151d6f2", "commit_rev":
"5d69b691ba652cfeb329dbdd9ae8cf6f8a1aaa8b"}

[commit-bot: I haz the power, 2016-11-29 11:55:58]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-29 11:57:36]

Description was changed from

==========
[heap] Reland: Use store buffer for writes coming from mutator.

This reverts commit 810fcb2866d265266b24515ff2d9348425c63aef.

BUG=chromium:648568, chromium:669270
==========

to

==========
[heap] Reland: Use store buffer for writes coming from mutator.

This reverts commit 810fcb2866d265266b24515ff2d9348425c63aef.

BUG=chromium:648568, chromium:669270

Committed: https://crrev.com/f3d119b9c5bb39ba994a6e437bfdacff9a6ff8fc
Cr-Commit-Position: refs/heads/master@{#41350}
==========

[commit-bot: I haz the power, 2016-11-29 11:57:37]

Patchset 2 (id:??) landed as
https://crrev.com/f3d119b9c5bb39ba994a6e437bfdacff9a6ff8fc
Cr-Commit-Position: refs/heads/master@{#41350}