[arm] Improve generation of flag setting instructions.

[arm] Improve generation of flag setting instructions.

Generate a flag-setting instruction for a binary operation when
the result is tested for equality/inequality to zero.

BUG=

Committed: https://crrev.com/9da7ac6fdb39274f6bdf34aeb683874d5f9150c0
Cr-Commit-Position: refs/heads/master@{#39183}

[georgia.kouveli, 2016-09-05 10:08:06]

georgia.kouveli@arm.com changed reviewers:
+ bmeurer@chromium.org, epertoso@chromium.org

[epertoso, 2016-09-05 15:08:09]

lgtm

[georgia.kouveli, 2016-09-05 15:54:33]

The CQ bit was checked by georgia.kouveli@arm.com

[commit-bot: I haz the power, 2016-09-05 15:54:38]

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, 2016-09-05 16:18:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-05 16:18:49]

Description was changed from

==========
[arm] Improve generation of flag setting instructions.

Generate a flag-setting instruction for a binary operation when
the result is tested for equality/inequality to zero.

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

to

==========
[arm] Improve generation of flag setting instructions.

Generate a flag-setting instruction for a binary operation when
the result is tested for equality/inequality to zero.

BUG=

Committed: https://crrev.com/9da7ac6fdb39274f6bdf34aeb683874d5f9150c0
Cr-Commit-Position: refs/heads/master@{#39183}
==========

[commit-bot: I haz the power, 2016-09-05 16:18:50]

Patchset 1 (id:??) landed as
https://crrev.com/9da7ac6fdb39274f6bdf34aeb683874d5f9150c0
Cr-Commit-Position: refs/heads/master@{#39183}