MIPS: Fix label position types in binding code.

MIPS: Fix label position types in binding code.

Also some target_at and target_at_put uniformed on mips and mips64.

BUG=

Committed: https://crrev.com/39f58c2451e087dcdece0916d750ae5719483234
Cr-Commit-Position: refs/heads/master@{#26785}

[balazs.kilvady, 2015-02-20 16:14:11]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, dusan.milosavljevic@imgtec.com, gergely.kis@imgtec.com,
paul.lind@imgtec.com

[dusmil.imgtec, 2015-02-20 17:09:55]

lgtm.

[balazs.kilvady, 2015-02-20 19:03:31]

The CQ bit was checked by balazs.kilvady@imgtec.com

[commit-bot: I haz the power, 2015-02-20 19:04:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/942123002/1

[commit-bot: I haz the power, 2015-02-20 19:29:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-20 19:29:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-20 19:30:25]

Patchset 1 (id:??) landed as
https://crrev.com/39f58c2451e087dcdece0916d750ae5719483234
Cr-Commit-Position: refs/heads/master@{#26785}