This adds support for load/store access to FAST_HOLEY_ELEMENTS and
FAST_HOLEY_SMI_ELEMENTS backing stores. We don't currently fully support
the double holes, because we make some difficult assumptions in
Crankshaft there.

R=jarin@chromium.org
BUG=v8:4470
LOG=n

Review URL: https://codereview.chromium.org/1448903002

Cr-Commit-Position: refs/heads/master@{#32012}