Reduce duplicate code in full-codegen across platforms.

Reduce duplicate code in full-codegen across platforms.

R=mvstanton@chromium.org

Committed: https://crrev.com/937d4efbf9c399339fdc8e041bec8e80baa7b58f
Cr-Commit-Position: refs/heads/master@{#29798}

Committed: https://crrev.com/0fe2fbd173c5e547e021476428001cac6fcdf7a9
Cr-Commit-Position: refs/heads/master@{#29805}

[mvstanton, 2015-07-23 07:33:17]

lgtm

[Yang, 2015-07-23 07:40:13]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-07-23 07:40:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1255613002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1255613002/1

[commit-bot: I haz the power, 2015-07-23 08:23:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-23 08:23:41]

Patchset 1 (id:??) landed as
https://crrev.com/937d4efbf9c399339fdc8e041bec8e80baa7b58f
Cr-Commit-Position: refs/heads/master@{#29798}

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

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1252513004/ by yangguo@chromium.org.

The reason for reverting is: breaks mips.

[Yang, 2015-07-23 11:18:56]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2015-07-23 11:18:56]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org
Link to the patchset: https://codereview.chromium.org/1255613002/#ps20001
(title: "fix mips")

[commit-bot: I haz the power, 2015-07-23 11:19:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1255613002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1255613002/20001

[commit-bot: I haz the power, 2015-07-23 11:46:03]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-23 11:46:16]

Patchset 2 (id:??) landed as
https://crrev.com/0fe2fbd173c5e547e021476428001cac6fcdf7a9
Cr-Commit-Position: refs/heads/master@{#29805}