PPC: [runtime] Introduce a proper %NewArray runtime entry.

PPC: [runtime] Introduce a proper %NewArray runtime entry.

Port ceade6cf239e0773213d53d55c36b19231c820b5

Original commit message:
    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.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:3101, v8:3330
LOG=n

Committed: https://crrev.com/8ced019a5936b55f9c2e647ff529a42f55c03d22
Cr-Commit-Position: refs/heads/master@{#32180}

[michael_dawson, 2015-11-23 14:23:49]

On 2015/11/20 23:44:39, mtbrandyberry wrote:

lgtm

[MTBrandyberry, 2015-11-23 14:37:38]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-11-23 14:37:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1466943002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1466943002/1

[commit-bot: I haz the power, 2015-11-23 14:59:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-23 15:00:10]

Patchset 1 (id:??) landed as
https://crrev.com/8ced019a5936b55f9c2e647ff529a42f55c03d22
Cr-Commit-Position: refs/heads/master@{#32180}