[heap] Invoke incremental marking step before allocation.

[heap] Invoke incremental marking step before allocation.

This ensures that the newly allocated object immediatly precedes the
linear allocation area, which is needed for allocation folding.

For more info see:
https://bugs.chromium.org/p/chromium/issues/detail?id=659165#c13

BUG=chromium:659165
Committed: https://crrev.com/bb24b91f1533decd1b586ef366efa10f6e5e4d75
Cr-Commit-Position: refs/heads/master@{#40704}

[ulan, 2016-11-02 11:50:31]

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

[ulan, 2016-11-02 11:50:31]

ptal, alternative solution for the same problem as cl 2469273002

[Michael Lippautz, 2016-11-02 12:38:38]

lgtm on the duct tape approach

like the other one better though

[ulan, 2016-11-02 13:42:35]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2016-11-02 13:42:43]

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 14:13:34]

Committed patchset #1 (id:1)

[Michael Achenbach, 2016-11-03 09:21:26]

The roll bisect job https://codereview.chromium.org/2466983004/ points to this
CL, though the gpu test seems to flakily timeout.

The roll got through as we had a flaky green run, but I'll have a look at the
gpu.fyi tests later.

[ulan, 2016-11-03 09:56:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2472043002/ by ulan@chromium.org.

The reason for reverting is: Performance regression on Octane and V8 runtime
stats..

[Michael Achenbach, 2016-11-03 15:58:55]

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

[Michael Achenbach, 2016-11-03 15:58:55]

This probably also causes a timeout on GPU FYI. CC sheriff.
https://build.chromium.org/p/chromium.gpu.fyi/builders/Linux%20Release%20%28N...

Started shortly after V8 rolled and the trybots showed this timeout several
times.

Should be fixed with next V8 roll as CL is already reverted.

[commit-bot: I haz the power, 2016-11-17 22:19:35]

Description was changed from

==========
[heap] Invoke incremental marking step before allocation.

This ensures that the newly allocated object immediatly precedes the
linear allocation area, which is needed for allocation folding.

For more info see:
https://bugs.chromium.org/p/chromium/issues/detail?id=659165#c13

BUG=chromium:659165
==========

to

==========
[heap] Invoke incremental marking step before allocation.

This ensures that the newly allocated object immediatly precedes the
linear allocation area, which is needed for allocation folding.

For more info see:
https://bugs.chromium.org/p/chromium/issues/detail?id=659165#c13

BUG=chromium:659165

Committed: https://crrev.com/bb24b91f1533decd1b586ef366efa10f6e5e4d75
Cr-Commit-Position: refs/heads/master@{#40704}
==========

[commit-bot: I haz the power, 2016-11-17 22:19:36]

Patchset 1 (id:??) landed as
https://crrev.com/bb24b91f1533decd1b586ef366efa10f6e5e4d75
Cr-Commit-Position: refs/heads/master@{#40704}