[elements] Fix GetEntryForIndexImpl to honor array length

[elements] Fix GetEntryForIndexImpl to honor array length

Previously, fast holey elements accessors would detect element presence
by simply doing a hole check on any slot within the backing store's
capacity. This relied on the (mostly-true but brittle) assumption that
slots beyond the length are always correctly zapped with The Hole.

Committed: https://crrev.com/e1cb5622246245901bf1e98e7c2b80d16338d67b
Cr-Commit-Position: refs/heads/master@{#39051}

[Jakob Kummerow, 2016-08-31 17:07:40]

jkummerow@chromium.org changed reviewers:
+ cbruni@chromium.org

[Jakob Kummerow, 2016-08-31 17:07:40]

PTAL.

[Camillo Bruni, 2016-08-31 17:13:23]

lgtm

[Jakob Kummerow, 2016-08-31 17:14:56]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2016-08-31 17:15:04]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-31 17:46:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-31 17:46:45]

Description was changed from

==========
[elements] Fix GetEntryForIndexImpl to honor array length

Previously, fast holey elements accessors would detect element presence
by simply doing a hole check on any slot within the backing store's
capacity. This relied on the (mostly-true but brittle) assumption that
slots beyond the length are always correctly zapped with The Hole.
==========

to

==========
[elements] Fix GetEntryForIndexImpl to honor array length

Previously, fast holey elements accessors would detect element presence
by simply doing a hole check on any slot within the backing store's
capacity. This relied on the (mostly-true but brittle) assumption that
slots beyond the length are always correctly zapped with The Hole.

Committed: https://crrev.com/e1cb5622246245901bf1e98e7c2b80d16338d67b
Cr-Commit-Position: refs/heads/master@{#39051}
==========

[commit-bot: I haz the power, 2016-08-31 17:46:46]

Patchset 1 (id:??) landed as
https://crrev.com/e1cb5622246245901bf1e98e7c2b80d16338d67b
Cr-Commit-Position: refs/heads/master@{#39051}