Revert of [heap] Preserve optimized code maps accross GCs.

Revert of [heap] Preserve optimized code maps accross GCs. (patchset #1 id:1 of https://codereview.chromium.org/1430293002/ )

Reason for revert:
Janks finalization of full GC.

Original issue's description:
> [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}

TBR=mvstanton@chromium.org,mstarzinger@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/78174a426d17c99aa899102220446dfd5b053fe5
Cr-Commit-Position: refs/heads/master@{#32173}

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

Created Revert of [heap] Preserve optimized code maps accross GCs.

[commit-bot: I haz the power, 2015-11-23 12:06:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1467213002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1467213002/1

[commit-bot: I haz the power, 2015-11-23 12:07:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-23 12:07:51]

Patchset 1 (id:??) landed as
https://crrev.com/78174a426d17c99aa899102220446dfd5b053fe5
Cr-Commit-Position: refs/heads/master@{#32173}

[Michael Starzinger, 2015-11-23 12:30:15]

LGTM.