[heap] pause/resume inline allocation observers around scavenge

[heap] pause/resume inline allocation observers around scavenge

We should not be counting the bump pointer allocations done during scavenge as
the objects are copied. The inline allocation observers were getting unnecessary
notifications.

R=hpayer@chromium.org, ulan@chromium.org
BUG=

Committed: https://crrev.com/cd81dd6d740ff82a1abbc68615e8769bd467f91e
Cr-Commit-Position: refs/heads/master@{#32153}

[Hannes Payer (out of office), 2015-11-20 15:05:34]

lgtm

[ofrobots, 2015-11-20 16:02:45]

The CQ bit was checked by ofrobots@google.com

[commit-bot: I haz the power, 2015-11-20 16:02:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1465633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1465633002/1

[commit-bot: I haz the power, 2015-11-20 16:20:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-20 16:20:25]

Patchset 1 (id:??) landed as
https://crrev.com/cd81dd6d740ff82a1abbc68615e8769bd467f91e
Cr-Commit-Position: refs/heads/master@{#32153}