Revert of Revert of Always optimize for adding properties to native objects.

Revert of Revert of Always optimize for adding properties to native objects. (patchset #1 id:1 of https://codereview.chromium.org/1098223004/)

Reason for revert:
Test failure was not due to this.

Original issue's description:
> Revert of Always optimize for adding properties to native objects. (patchset #1 id:1 of https://codereview.chromium.org/1094383004/)
>
> Reason for revert:
> GC stress failure (custom snapshot)
>
> Original issue's description:
> > Always optimize for adding properties to native objects.
> >
> > R=jkummerow@chromium.org
> >
> > Committed: https://crrev.com/c715098e85b93def76c0b3f54290c811dea04f01
> > Cr-Commit-Position: refs/heads/master@{#28003}
>
> TBR=jkummerow@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/bb6958ceff221e66adbc4581471a8ce1b41a4684
> Cr-Commit-Position: refs/heads/master@{#28009}

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

Committed: https://crrev.com/616bc79533b4b95279cb4c0058ecd15e93fb04b1
Cr-Commit-Position: refs/heads/master@{#28011}

[Yang, 2015-04-22 14:13:38]

Created Revert of Revert of Always optimize for adding properties to native
objects.

[commit-bot: I haz the power, 2015-04-22 14:13:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1100123002/1

[commit-bot: I haz the power, 2015-04-22 14:14:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-22 14:14:23]

Patchset 1 (id:??) landed as
https://crrev.com/616bc79533b4b95279cb4c0058ecd15e93fb04b1
Cr-Commit-Position: refs/heads/master@{#28011}