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=

Review URL: https://codereview.chromium.org/1131203002

Cr-Commit-Position: refs/heads/master@{#28309}