[runtime] Introduce a proper %NewArray runtime entry.

[runtime] Introduce a proper %NewArray runtime entry.

This adds a new %NewArray runtime entry, which constructs a new JSArray
and does the subclassing correctly (to the same degree that %NewObject
does currently), and also deals properly with the AllocationSite
feedback mechanism. This runtime entry will be used by TurboFan and is
also used as a fallback in the subclassing case in the stub currently.

BUG=v8:3101, v8:3330
LOG=n

Committed: https://crrev.com/ceade6cf239e0773213d53d55c36b19231c820b5
Cr-Commit-Position: refs/heads/master@{#32131}

[Benedikt Meurer, 2015-11-20 06:03:05]

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

[Benedikt Meurer, 2015-11-20 06:03:05]

Hey Yang,

Some cleanup for the Array constructor.
Please take a look.

Thanks,
Benedikt

[Yang, 2015-11-20 06:17:35]

On 2015/11/20 06:03:05, Benedikt Meurer wrote:
> Hey Yang,
> 
> Some cleanup for the Array constructor.
> Please take a look.
> 
> Thanks,
> Benedikt

lgtm.

[Benedikt Meurer, 2015-11-20 06:19:57]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-11-20 06:20:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1456423003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1456423003/1

[commit-bot: I haz the power, 2015-11-20 06:21:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-20 06:21:38]

Patchset 1 (id:??) landed as
https://crrev.com/ceade6cf239e0773213d53d55c36b19231c820b5
Cr-Commit-Position: refs/heads/master@{#32131}