PPC: Vector ICs: Get rid of stack arguments on ia32 transitioning stores.

PPC: Vector ICs: Get rid of stack arguments on ia32 transitioning stores.

Port 2d4aeaad2fa3888c5e4cbfd30f6338e1fbf794e9

Original commit message:
    The stack manipulation was expensive. Two virtual registers are better.

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

Committed: https://crrev.com/f7a35b9a6ea04e4c9331a75c24846d38d4a210c2
Cr-Commit-Position: refs/heads/master@{#31213}

[MTBrandyberry, 2015-10-12 13:49:07]

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

[commit-bot: I haz the power, 2015-10-12 13:49:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1390343004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1390343004/1

[commit-bot: I haz the power, 2015-10-12 14:11:15]

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

[commit-bot: I haz the power, 2015-10-12 14:11:15]

Dry run: This issue passed the CQ dry run.

[dstence, 2015-10-12 14:26:25]

lgtm

[MTBrandyberry, 2015-10-12 14:31:48]

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

[commit-bot: I haz the power, 2015-10-12 14:31:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1390343004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1390343004/1

[MTBrandyberry, 2015-10-12 15:06:45]

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

[MTBrandyberry, 2015-10-12 15:07:27]

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

[commit-bot: I haz the power, 2015-10-12 15:07:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1390343004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1390343004/1

[commit-bot: I haz the power, 2015-10-12 15:18:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-12 15:18:48]

Patchset 1 (id:??) landed as
https://crrev.com/f7a35b9a6ea04e4c9331a75c24846d38d4a210c2
Cr-Commit-Position: refs/heads/master@{#31213}