Revert removal of TypedArray constructor optimization

Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

The optimization was previously removed in
https://codereview.chromium.org/1767893002

BUG=chromium:593644
R=adamk
LOG=Y

Committed: https://crrev.com/5f5c48da64ba6ac91f73b812ff41a36285d629e3
Cr-Commit-Position: refs/heads/master@{#34697}

[Dan Ehrenberg, 2016-03-10 22:12:40]

Description was changed from

==========
Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

BUG=chromium:593644
R=adamk
LOG=Y
==========

to

==========
Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

The optimization was previously removed in
https://codereview.chromium.org/1767893002

BUG=chromium:593644
R=adamk
LOG=Y
==========

[Dan Ehrenberg, 2016-03-10 22:12:43]

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

[commit-bot: I haz the power, 2016-03-10 22:12:51]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1779373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1779373002/1

[adamk, 2016-03-10 23:11:21]

lgtm

[Dan Ehrenberg, 2016-03-10 23:16:43]

The CQ bit was unchecked by littledan@chromium.org

[Dan Ehrenberg, 2016-03-10 23:16:45]

The CQ bit was checked by littledan@chromium.org

[commit-bot: I haz the power, 2016-03-10 23:16:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1779373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1779373002/1

[commit-bot: I haz the power, 2016-03-10 23:25:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-10 23:26:35]

Description was changed from

==========
Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

The optimization was previously removed in
https://codereview.chromium.org/1767893002

BUG=chromium:593644
R=adamk
LOG=Y
==========

to

==========
Revert removal of TypedArray constructor optimization

When the TypedArray iterator constructor code path was added, a technically
incorrect optimization was added which uses the arraylike code path on array
arguments, even though the %ArrayIterator% could have been monkey-patched
to give different behavior. A previous patch removed this optimization, and
this patch restores it due to the huge performance regression that resulted.

The optimization was previously removed in
https://codereview.chromium.org/1767893002

BUG=chromium:593644
R=adamk
LOG=Y

Committed: https://crrev.com/5f5c48da64ba6ac91f73b812ff41a36285d629e3
Cr-Commit-Position: refs/heads/master@{#34697}
==========

[commit-bot: I haz the power, 2016-03-10 23:26:36]

Patchset 1 (id:??) landed as
https://crrev.com/5f5c48da64ba6ac91f73b812ff41a36285d629e3
Cr-Commit-Position: refs/heads/master@{#34697}