[turbofan] ARM: Implement vswp and use in gap resolver

[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=

Committed: https://crrev.com/2837c2e65a2ee5b9fc610f30ce1215f52323ecbd
Cr-Commit-Position: refs/heads/master@{#39209}

[martyn.capewell, 2016-09-06 10:48:50]

Description was changed from

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=
==========

to

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=
==========

[martyn.capewell, 2016-09-06 10:48:51]

martyn.capewell@arm.com changed reviewers:
+ bmeurer@chromium.org, epertoso@chromium.org

[Benedikt Meurer, 2016-09-06 10:57:23]

Nice, LGTM.

[martyn.capewell, 2016-09-06 12:18:28]

The CQ bit was checked by martyn.capewell@arm.com

[commit-bot: I haz the power, 2016-09-06 12:18:35]

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, 2016-09-06 12:49:34]

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

[commit-bot: I haz the power, 2016-09-06 12:49:35]

Try jobs failed on following builders:
  v8_linux_arm_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng/builds/...)
  v8_linux_arm_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng_trigger...)

[martyn.capewell, 2016-09-06 13:28:50]

The CQ bit was checked by martyn.capewell@arm.com

[martyn.capewell, 2016-09-06 13:28:51]

The patchset sent to the CQ was uploaded after l-g-t-m from bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/2313803003/#ps20001
(title: "Fix git's broken rebase")

[commit-bot: I haz the power, 2016-09-06 13:28:57]

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, 2016-09-06 14:07:05]

Description was changed from

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=
==========

to

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=
==========

[commit-bot: I haz the power, 2016-09-06 14:07:06]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-06 14:07:16]

Description was changed from

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=
==========

to

==========
[turbofan] ARM: Implement vswp and use in gap resolver

Use vswp to switch double-precision registers in the gap resolver, with fall
back temp register-based code if NEON is not available.

BUG=

Committed: https://crrev.com/2837c2e65a2ee5b9fc610f30ce1215f52323ecbd
Cr-Commit-Position: refs/heads/master@{#39209}
==========

[commit-bot: I haz the power, 2016-09-06 14:07:17]

Patchset 2 (id:??) landed as
https://crrev.com/2837c2e65a2ee5b9fc610f30ce1215f52323ecbd
Cr-Commit-Position: refs/heads/master@{#39209}

[Michael Achenbach, 2016-09-06 14:22:25]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2314003003/ by machenbach@chromium.org.

The reason for reverting is: Breaks arm compilation:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Arm%20-%20builder/....