[wasm] Some cleanup in the Int64Lowering.

[wasm] Some cleanup in the Int64Lowering.

I removed some stale comments and added a missing unit test.

R=titzer@chromium.org

Committed: https://crrev.com/7634d1aac172a73bf650e5f54f654bb32ccf0d38
Cr-Commit-Position: refs/heads/master@{#34586}

[titzer, 2016-03-08 13:58:18]

lgtm

[ahaas, 2016-03-08 14:07:06]

The CQ bit was checked by ahaas@chromium.org

[commit-bot: I haz the power, 2016-03-08 14:07:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1772843003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1772843003/1

[commit-bot: I haz the power, 2016-03-08 14:11:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-08 14:12:45]

Description was changed from

==========
[wasm] Some cleanup in the Int64Lowering.

I removed some stale comments and added a missing unit test.

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

to

==========
[wasm] Some cleanup in the Int64Lowering.

I removed some stale comments and added a missing unit test.

R=titzer@chromium.org

Committed: https://crrev.com/7634d1aac172a73bf650e5f54f654bb32ccf0d38
Cr-Commit-Position: refs/heads/master@{#34586}
==========

[commit-bot: I haz the power, 2016-03-08 14:12:45]

Patchset 1 (id:??) landed as
https://crrev.com/7634d1aac172a73bf650e5f54f654bb32ccf0d38
Cr-Commit-Position: refs/heads/master@{#34586}