[Runtime] Use ElementsAccessor in NewWithSpread.

[Runtime] Use ElementsAccessor in NewWithSpread.

Speeds up some benchmarks that make heavy use of derived constructors.

BUG=chromium:672075
Committed: https://crrev.com/6051e89600733e5cd8cda110c8c68770ef485835
Cr-Commit-Position: refs/heads/master@{#41580}

[petermarshall, 2016-12-08 08:52:28]

The CQ bit was checked by petermarshall@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-08 08:52:38]

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

[petermarshall, 2016-12-08 08:59:51]

petermarshall@chromium.org changed reviewers:
+ bmeurer@chromium.org

[petermarshall, 2016-12-08 08:59:52]

PTAL

[commit-bot: I haz the power, 2016-12-08 09:17:44]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-08 09:17:45]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2016-12-08 09:31:48]

Nice. LGTM.

[petermarshall, 2016-12-08 09:32:32]

The CQ bit was checked by petermarshall@chromium.org

[commit-bot: I haz the power, 2016-12-08 09:32:41]

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, 2016-12-08 09:34:16]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481189552832240, "parent_rev":
"15fc99a06fca2e5889c996a009a7f1ca9c96257f", "commit_rev":
"d323059ffd9b76a014a385a22c4fbaa77c01b13a"}

[commit-bot: I haz the power, 2016-12-08 09:34:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-08 09:34:36]

Description was changed from

==========
[Runtime] Use ElementsAccessor in NewWithSpread.

Speeds up some benchmarks that make heavy use of derived constructors.

BUG=chromium:672075
==========

to

==========
[Runtime] Use ElementsAccessor in NewWithSpread.

Speeds up some benchmarks that make heavy use of derived constructors.

BUG=chromium:672075

Committed: https://crrev.com/6051e89600733e5cd8cda110c8c68770ef485835
Cr-Commit-Position: refs/heads/master@{#41580}
==========

[commit-bot: I haz the power, 2016-12-08 09:34:37]

Patchset 1 (id:??) landed as
https://crrev.com/6051e89600733e5cd8cda110c8c68770ef485835
Cr-Commit-Position: refs/heads/master@{#41580}