PPC: Remove receiver conversion from function prologue

PPC: Remove receiver conversion from function prologue

Port 4ab1b05d5ec15f25085383e34e3b326bdbf990fc

Original commit message:
    Depends on https://codereview.chromium.org/1407373007/
    After that CL, all receiver conversion is handled by the call builtin.

R=verwaest@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Committed: https://crrev.com/96baec278c8c7fe69c96fa0773b0640f65d490ae
Cr-Commit-Position: refs/heads/master@{#31902}

[MTBrandyberry, 2015-11-09 20:25:28]

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 20:25:34]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1412803014/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1412803014/1

[michael_dawson, 2015-11-09 20:40:27]

On 2015/11/09 20:25:34, 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/1412803014/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1412803014/1

lgtm

[commit-bot: I haz the power, 2015-11-09 20:49:48]

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

[commit-bot: I haz the power, 2015-11-09 20:49:48]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-11-09 20:53:52]

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

[commit-bot: I haz the power, 2015-11-09 20:54:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1412803014/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1412803014/1

[commit-bot: I haz the power, 2015-11-09 20:55:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-09 20:56:00]

Patchset 1 (id:??) landed as
https://crrev.com/96baec278c8c7fe69c96fa0773b0640f65d490ae
Cr-Commit-Position: refs/heads/master@{#31902}