Revert "Use WeakCells in the optimized code map rather than traversing in pause."

Revert "Use WeakCells in the optimized code map rather than traversing in pause."

Reason for revert:
Probably causes GC stress test failures.

TBR=mvstanton@chromium.org
BUG=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/39b207ddacad95b9ff98cc94a3baa6335e256519
Cr-Commit-Position: refs/heads/master@{#32574}

[neis, 2015-12-03 16:03:37]

The CQ bit was checked by neis@chromium.org

[commit-bot: I haz the power, 2015-12-03 16:03:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1493393002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1493393002/1

[commit-bot: I haz the power, 2015-12-03 16:04:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-03 16:04:48]

Description was changed from

==========
Revert "Use WeakCells in the optimized code map rather than traversing in
pause."

Reason for revert:
Probably causes GC stress test failures.

TBR=mvstanton@chromium.org
BUG=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert "Use WeakCells in the optimized code map rather than traversing in
pause."

Reason for revert:
Probably causes GC stress test failures.

TBR=mvstanton@chromium.org
BUG=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/39b207ddacad95b9ff98cc94a3baa6335e256519
Cr-Commit-Position: refs/heads/master@{#32574}
==========

[commit-bot: I haz the power, 2015-12-03 16:04:49]

Patchset 1 (id:??) landed as
https://crrev.com/39b207ddacad95b9ff98cc94a3baa6335e256519
Cr-Commit-Position: refs/heads/master@{#32574}