Revert of Allow loading holes from holey smi arrays

Revert of Allow loading holes from holey smi arrays (patchset #2 id:20001 of https://codereview.chromium.org/1134483002/)

Reason for revert:
Shouldn't unconditionally load holes since it tanks performance. I'll change it in a follow-up to only do it if the IC ever saw it happen.

Original issue's description:
> Allow loading holes from holey smi arrays
>
> BUG=
>
> Committed: https://crrev.com/eab5bb5390fab79d063f29398377c6d181963dde
> Cr-Commit-Position: refs/heads/master@{#28298}

TBR=mvstanton@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/43d5319143c885c8acb0cd2f71726526ba97a2b7
Cr-Commit-Position: refs/heads/master@{#28309}

[Toon Verwaest, 2015-05-08 07:28:33]

Created Revert of Allow loading holes from holey smi arrays

[commit-bot: I haz the power, 2015-05-08 07:28:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131203002/1

[commit-bot: I haz the power, 2015-05-08 07:29:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-08 07:29:10]

Patchset 1 (id:??) landed as
https://crrev.com/43d5319143c885c8acb0cd2f71726526ba97a2b7
Cr-Commit-Position: refs/heads/master@{#28309}

[mvstanton, 2015-05-08 07:34:09]

lgtm