[wasm] Refactoring pair-shift code in the instruction selector of arm and ia32.

[wasm] Refactoring pair-shift code in the instruction selector of arm and ia32.

R=titzer@chromium.org

Committed: https://crrev.com/f954934d6237998f26b6784b22b1e6f02b8b430b
Cr-Commit-Position: refs/heads/master@{#35140}

[titzer, 2016-03-30 12:57:07]

lgtm

[ahaas, 2016-03-30 14:22:34]

The CQ bit was checked by ahaas@chromium.org

[ahaas, 2016-03-30 14:22:34]

The patchset sent to the CQ was uploaded after l-g-t-m from titzer@chromium.org
Link to the patchset: https://codereview.chromium.org/1842013002/#ps20001
(title: "Restored the original arm code.")

[commit-bot: I haz the power, 2016-03-30 14:22:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1842013002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1842013002/20001

[commit-bot: I haz the power, 2016-03-30 14:24:42]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-03-30 14:26:27]

Description was changed from

==========
[wasm] Refactoring pair-shift code in the instruction selector of arm and ia32.

R=titzer@chromium.org
==========

to

==========
[wasm] Refactoring pair-shift code in the instruction selector of arm and ia32.

R=titzer@chromium.org

Committed: https://crrev.com/f954934d6237998f26b6784b22b1e6f02b8b430b
Cr-Commit-Position: refs/heads/master@{#35140}
==========

[commit-bot: I haz the power, 2016-03-30 14:26:28]

Patchset 2 (id:??) landed as
https://crrev.com/f954934d6237998f26b6784b22b1e6f02b8b430b
Cr-Commit-Position: refs/heads/master@{#35140}