Revert of Activate preserving of optimized code map accross GCs.

Revert of Activate preserving of optimized code map accross GCs. (patchset #1 id:1 of https://codereview.chromium.org/1217863006/)

Reason for revert:
This CL may be the reason for the spike on memory corruption. Tentatively reverting this CL.

BUG=chromium:512780
LOG=n

Original issue's description:
> Activate preserving of optimized code map accross GCs.
>
> This enables --noflush-optimized-code-cache which allows preserving
> entries in the optimized code map accross GCs. This only applies to
> values being reachable through other paths.
>
> R=hpayer@chromium.org,hablich@chromium.org
>
> Committed: https://crrev.com/1a8776db25b63c4ce718423772d1fd13f58eeab5
> Cr-Commit-Position: refs/heads/master@{#29755}

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

Committed: https://crrev.com/4b6770867a08fe96b7643e4fee6de1a5c01a1ae9
Cr-Commit-Position: refs/heads/master@{#29888}

[Hannes Payer (out of office), 2015-07-28 07:27:48]

Created Revert of Activate preserving of optimized code map accross GCs.

[commit-bot: I haz the power, 2015-07-28 07:27:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1255043003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1255043003/1

[commit-bot: I haz the power, 2015-07-28 07:28:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-28 07:28:27]

Patchset 1 (id:??) landed as
https://crrev.com/4b6770867a08fe96b7643e4fee6de1a5c01a1ae9
Cr-Commit-Position: refs/heads/master@{#29888}