PPC: Refine "[ic] Fixed receiver_map register trashing in KeyedStoreIC megamorphic."

PPC: Refine "[ic] Fixed receiver_map register trashing in KeyedStoreIC megamorphic."

Do not abstract r0 as a general scratch register -- usage is valid
only in short, localized sequences (since its value may be altered
implicitly by some macro operations).

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:571370
LOG=N

Committed: https://crrev.com/49e25ff4c7fb148cbbb6b4dc3fad33e180b64316
Cr-Commit-Position: refs/heads/master@{#33062}

[MTBrandyberry, 2015-12-30 14:40:51]

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

[commit-bot: I haz the power, 2015-12-30 14:41:15]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1556643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1556643002/1

[commit-bot: I haz the power, 2015-12-30 15:02:02]

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

[commit-bot: I haz the power, 2015-12-30 15:02:03]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2015-12-30 15:43:57]

On 2015/12/30 15:02:03, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2015-12-30 16:07:58]

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

[commit-bot: I haz the power, 2015-12-30 16:08:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1556643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1556643002/1

[commit-bot: I haz the power, 2015-12-30 16:09:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-30 16:10:12]

Description was changed from

==========
PPC: Refine "[ic] Fixed receiver_map register trashing in KeyedStoreIC
megamorphic."

Do not abstract r0 as a general scratch register -- usage is valid
only in short, localized sequences (since its value may be altered
implicitly by some macro operations).

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:571370
LOG=N
==========

to

==========
PPC: Refine "[ic] Fixed receiver_map register trashing in KeyedStoreIC
megamorphic."

Do not abstract r0 as a general scratch register -- usage is valid
only in short, localized sequences (since its value may be altered
implicitly by some macro operations).

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:571370
LOG=N

Committed: https://crrev.com/49e25ff4c7fb148cbbb6b4dc3fad33e180b64316
Cr-Commit-Position: refs/heads/master@{#33062}
==========

[commit-bot: I haz the power, 2015-12-30 16:10:13]

Patchset 1 (id:??) landed as
https://crrev.com/49e25ff4c7fb148cbbb6b4dc3fad33e180b64316
Cr-Commit-Position: refs/heads/master@{#33062}