Revert of Reduce duplicate code in full-codegen across platforms.

Revert of Reduce duplicate code in full-codegen across platforms. (patchset #1 id:1 of https://codereview.chromium.org/1255613002/)

Reason for revert:
breaks mips

Original issue's description:
> Reduce duplicate code in full-codegen across platforms.
>
> R=mvstanton@chromium.org
>
> Committed: https://crrev.com/937d4efbf9c399339fdc8e041bec8e80baa7b58f
> Cr-Commit-Position: refs/heads/master@{#29798}

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

Committed: https://crrev.com/8de3518e3a51d650683641b8968c6d3e1252391a
Cr-Commit-Position: refs/heads/master@{#29802}

[Yang, 2015-07-23 09:49:25]

Created Revert of Reduce duplicate code in full-codegen across platforms.

[commit-bot: I haz the power, 2015-07-23 09:49:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1252513004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1252513004/1

[commit-bot: I haz the power, 2015-07-23 09:50:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-23 09:50:41]

Patchset 1 (id:??) landed as
https://crrev.com/8de3518e3a51d650683641b8968c6d3e1252391a
Cr-Commit-Position: refs/heads/master@{#29802}