[heap] Preserve optimized code maps accross GCs.

[heap] Preserve optimized code maps accross GCs.

This disables the eager flushing of optimized code maps during full GCs
and instead treats entries in those tables weakly by default. Note that
for now entries are removed when one of its components dies.

R=mvstanton@chromium.org

Committed: https://crrev.com/7a1377aab2ba4e2c9a7d422b51f645cbbaec10c7
Cr-Commit-Position: refs/heads/master@{#32045}

[Michael Starzinger, 2015-11-09 17:32:32]

Description was changed from

==========
[heap] Preserve optimized code maps accross GCs.

This disables the eager flushing of optimized code maps during full GCs
and instead treats entries in those tables weakly by default. Note that
for now entries are removed when one of its components dies.

R=mvstanton@chromium.org
==========

to

==========
[heap] Preserve optimized code maps accross GCs.

This disables the eager flushing of optimized code maps during full GCs
and instead treats entries in those tables weakly by default. Note that
for now entries are removed when one of its components dies.

R=mvstanton@chromium.org
==========

[mvstanton, 2015-11-10 08:43:50]

Yeah! LGTM.

[Michael Starzinger, 2015-11-10 09:04:47]

As discussed offline: I will hold off from landing this until Monday till after
the branch cut, because this has the possibility to create a singularity and set
the world on fire. Feel free to CQ on Monday in case I forget.

[Michael Starzinger, 2015-11-17 13:44:06]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-11-17 13:44:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1430293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1430293002/1

[commit-bot: I haz the power, 2015-11-17 14:11:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-17 14:11:34]

Patchset 1 (id:??) landed as
https://crrev.com/7a1377aab2ba4e2c9a7d422b51f645cbbaec10c7
Cr-Commit-Position: refs/heads/master@{#32045}

[Hannes Payer (out of office), 2015-11-23 12:06:43]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1467213002/ by hpayer@chromium.org.

The reason for reverting is: Janks finalization of full GC..