[runtime] Make sure %ForInPrepare returns the correct length.

[runtime] Make sure %ForInPrepare returns the correct length.

In case the receiver map has an enum cache, %ForInPrepare returns the
length of the actual enum cache, which might include properties that
are further down the transition tree tho.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/56e1b13ea12fb2a9f4153b3cd0c7f86ab8bcc9cf
Cr-Commit-Position: refs/heads/master@{#33469}

[Jarin, 2016-01-22 14:37:19]

lgtm

[Benedikt Meurer, 2016-01-22 14:38:01]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-01-22 14:38:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1619353002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1619353002/1

[commit-bot: I haz the power, 2016-01-22 14:51:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-22 14:52:27]

Description was changed from

==========
[runtime] Make sure %ForInPrepare returns the correct length.

In case the receiver map has an enum cache, %ForInPrepare returns the
length of the actual enum cache, which might include properties that
are further down the transition tree tho.

R=jarin@chromium.org
BUG=v8:3650
LOG=n
==========

to

==========
[runtime] Make sure %ForInPrepare returns the correct length.

In case the receiver map has an enum cache, %ForInPrepare returns the
length of the actual enum cache, which might include properties that
are further down the transition tree tho.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/56e1b13ea12fb2a9f4153b3cd0c7f86ab8bcc9cf
Cr-Commit-Position: refs/heads/master@{#33469}
==========

[commit-bot: I haz the power, 2016-01-22 14:52:28]

Patchset 1 (id:??) landed as
https://crrev.com/56e1b13ea12fb2a9f4153b3cd0c7f86ab8bcc9cf
Cr-Commit-Position: refs/heads/master@{#33469}