[arm64] Fix handling of CMN and ADD/SUB with overflow in VisitBinop.

[arm64] Fix handling of CMN and ADD/SUB with overflow in VisitBinop.

CMN is a flag-setting add operation, and therefore is commutative.
{Add,Sub}WithOverflow generate ADD/SUB instructions that cannot
support a ROR shift.

BUG=

Committed: https://crrev.com/f5d90fc9f2e2aa324f3a00d9ac3f6445f5f2d126
Cr-Commit-Position: refs/heads/master@{#37212}

[georgia.kouveli, 2016-06-23 10:26:19]

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

[epertoso, 2016-06-23 10:48:39]

lgtm

[georgia.kouveli, 2016-06-23 10:53:48]

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

[commit-bot: I haz the power, 2016-06-23 10:53:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2087233005/1

[commit-bot: I haz the power, 2016-06-23 11:27:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-23 11:29:32]

Description was changed from

==========
[arm64] Fix handling of CMN and ADD/SUB with overflow in VisitBinop.

CMN is a flag-setting add operation, and therefore is commutative.
{Add,Sub}WithOverflow generate ADD/SUB instructions that cannot
support a ROR shift.

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

to

==========
[arm64] Fix handling of CMN and ADD/SUB with overflow in VisitBinop.

CMN is a flag-setting add operation, and therefore is commutative.
{Add,Sub}WithOverflow generate ADD/SUB instructions that cannot
support a ROR shift.

BUG=

Committed: https://crrev.com/f5d90fc9f2e2aa324f3a00d9ac3f6445f5f2d126
Cr-Commit-Position: refs/heads/master@{#37212}
==========

[commit-bot: I haz the power, 2016-06-23 11:29:34]

Patchset 1 (id:??) landed as
https://crrev.com/f5d90fc9f2e2aa324f3a00d9ac3f6445f5f2d126
Cr-Commit-Position: refs/heads/master@{#37212}