[turbofan] Support cmp with shift/extend on ARM64.

[turbofan] Support cmp with shift/extend on ARM64.

Support 32-bit cmp with shift/extend by reusing the existing add/sub shift and
extend code.

Committed: https://crrev.com/1297a51e3024352ddb16e976bf4401551fa16ad5
Cr-Commit-Position: refs/heads/master@{#29435}

[martyn.capewell, 2015-07-01 08:25:45]

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

[Benedikt Meurer, 2015-07-02 04:09:27]

LGTM.

[Benedikt Meurer, 2015-07-02 04:09:34]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-07-02 04:09:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1218103005/1

[commit-bot: I haz the power, 2015-07-02 04:09:39]

The author martyn.capewell@arm.com has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-07-02 04:32:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-02 04:32:25]

Patchset 1 (id:??) landed as
https://crrev.com/1297a51e3024352ddb16e976bf4401551fa16ad5
Cr-Commit-Position: refs/heads/master@{#29435}