PPC: Remove CallFunctionStub, always call through the Call builtin (also from CallIC).

PPC: Remove CallFunctionStub, always call through the Call builtin (also from CallIC).

Port 44c44521ae11859478b42004f57ea93df52526ee

Original commit message:
    This fixes receiver conversion since the Call builtin does it correctly.

R=verwaest@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=v8:4526
LOG=n

Committed: https://crrev.com/44fcc2e7950fdaf4fb3d36c61370a6011bb654ea
Cr-Commit-Position: refs/heads/master@{#31901}

[MTBrandyberry, 2015-11-09 20:25:15]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-09 20:25:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423973006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423973006/1

[michael_dawson, 2015-11-09 20:43:35]

On 2015/11/09 20:25:19, commit-bot: I haz the power wrote:
> Dry run: CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1423973006/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1423973006/1

lgtm

[commit-bot: I haz the power, 2015-11-09 20:44:03]

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

[commit-bot: I haz the power, 2015-11-09 20:44:03]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-11-09 20:46:09]

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

[commit-bot: I haz the power, 2015-11-09 20:46:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1423973006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1423973006/1

[commit-bot: I haz the power, 2015-11-09 20:47:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-09 20:48:42]

Patchset 1 (id:??) landed as
https://crrev.com/44fcc2e7950fdaf4fb3d36c61370a6011bb654ea
Cr-Commit-Position: refs/heads/master@{#31901}