[heap] Aggressive code flushing in GC stress mode.

[heap] Aggressive code flushing in GC stress mode.

This disregards the code age heuristic when deciding whether to flush
code so that GC stress mode is more likely to flush out potential races
between our various "invariants".

R=hpayer@chromium.org

Committed: https://crrev.com/28a3f23e50f1847dd1152e6bb4aa0579acbdaaab
Cr-Commit-Position: refs/heads/master@{#32414}

[Hannes Payer (out of office), 2015-11-30 17:01:15]

lgtm

[Michael Starzinger, 2015-11-30 17:17:00]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-11-30 17:17:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1483993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1483993002/1

[commit-bot: I haz the power, 2015-11-30 17:24:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-30 17:24:26]

Description was changed from

==========
[heap] Aggressive code flushing in GC stress mode.

This disregards the code age heuristic when deciding whether to flush
code so that GC stress mode is more likely to flush out potential races
between our various "invariants".

R=hpayer@chromium.org
==========

to

==========
[heap] Aggressive code flushing in GC stress mode.

This disregards the code age heuristic when deciding whether to flush
code so that GC stress mode is more likely to flush out potential races
between our various "invariants".

R=hpayer@chromium.org

Committed: https://crrev.com/28a3f23e50f1847dd1152e6bb4aa0579acbdaaab
Cr-Commit-Position: refs/heads/master@{#32414}
==========

[commit-bot: I haz the power, 2015-11-30 17:24:27]

Patchset 1 (id:??) landed as
https://crrev.com/28a3f23e50f1847dd1152e6bb4aa0579acbdaaab
Cr-Commit-Position: refs/heads/master@{#32414}

[Michael Starzinger, 2015-11-30 19:09:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1485823002/ by mstarzinger@chromium.org.

The reason for reverting is: This breaks (surprise) GC stress with custom
snapshot, cannot reproduce, will need to investigate further.

https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20...
.