S390: Fix fast-allocate to handle alignment

S390: Fix fast-allocate to handle alignment

In fast-allocate, the path that leverages Add Mem-Imm fails to take
into account that the allocation size may be adjusted by kDoubleSize/2
for alignment.  Limit this instruction to 64-bit only.

Also guard PFDs with the proper facility check.
R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2605063002
Cr-Commit-Position: refs/heads/master@{#41978}
Committed: https://chromium.googlesource.com/v8/v8/+/e0f97ebb32d3bd3f5f94927f81717e7ee8b0a7d3

[JoranSiu, 2016-12-28 16:46:04]

The CQ bit was checked by joransiu@ca.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-12-28 16:46:11]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[JoranSiu, 2016-12-28 16:46:17]

ptal

[JaideepBajwa, 2016-12-28 17:01:44]

lgtm

[commit-bot: I haz the power, 2016-12-28 17:06:58]

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

[commit-bot: I haz the power, 2016-12-28 17:06:59]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2016-12-28 17:09:46]

The CQ bit was checked by joransiu@ca.ibm.com

[commit-bot: I haz the power, 2016-12-28 17:09:49]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-28 17:11:25]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482944986428700, "parent_rev":
"743b89768c3caea1aaca2e25c9058cbdec1e0019", "commit_rev":
"e0f97ebb32d3bd3f5f94927f81717e7ee8b0a7d3"}

[commit-bot: I haz the power, 2016-12-28 17:11:28]

Description was changed from

==========
S390: Fix fast-allocate to handle alignment

In fast-allocate, the path that leverages Add Mem-Imm fails to take
into account that the allocation size may be adjusted by kDoubleSize/2
for alignment.  Limit this instruction to 64-bit only.

Also guard PFDs with the proper facility check.
R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=
==========

to

==========
S390: Fix fast-allocate to handle alignment

In fast-allocate, the path that leverages Add Mem-Imm fails to take
into account that the allocation size may be adjusted by kDoubleSize/2
for alignment.  Limit this instruction to 64-bit only.

Also guard PFDs with the proper facility check.
R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2605063002
Cr-Commit-Position: refs/heads/master@{#41978}
Committed:
https://chromium.googlesource.com/v8/v8/+/e0f97ebb32d3bd3f5f94927f81717e7ee8b...
==========

[commit-bot: I haz the power, 2016-12-28 17:11:29]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/e0f97ebb32d3bd3f5f94927f81717e7ee8b...