[turbofan] Fix invalid comparison operator narrowing.

[turbofan] Fix invalid comparison operator narrowing.

When we narrow a signed32 comparison to uint8 or uint16 representation,
we also need to change the condition to unsigned comparisons otherwise
the comparison will be done on int16/int8 which interprets the narrowed
bits wrong.

R=epertoso@chromium.org
BUG=v8:5254
Committed: https://crrev.com/a758144329b7ddda258e41ea5d8abfca8595e34c
Cr-Commit-Position: refs/heads/master@{#38231}

[Benedikt Meurer, 2016-08-02 07:04:53]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-02 07:04:55]

Dry run: 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, 2016-08-02 07:27:46]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-02 07:27:47]

Dry run: This issue passed the CQ dry run.

[epertoso, 2016-08-02 07:41:00]

lgtm

[Benedikt Meurer, 2016-08-02 07:41:44]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-08-02 07:41:52]

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, 2016-08-02 07:44:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-02 07:46:25]

Description was changed from

==========
[turbofan] Fix invalid comparison operator narrowing.

When we narrow a signed32 comparison to uint8 or uint16 representation,
we also need to change the condition to unsigned comparisons otherwise
the comparison will be done on int16/int8 which interprets the narrowed
bits wrong.

R=epertoso@chromium.org
BUG=v8:5254
==========

to

==========
[turbofan] Fix invalid comparison operator narrowing.

When we narrow a signed32 comparison to uint8 or uint16 representation,
we also need to change the condition to unsigned comparisons otherwise
the comparison will be done on int16/int8 which interprets the narrowed
bits wrong.

R=epertoso@chromium.org
BUG=v8:5254

Committed: https://crrev.com/a758144329b7ddda258e41ea5d8abfca8595e34c
Cr-Commit-Position: refs/heads/master@{#38231}
==========

[commit-bot: I haz the power, 2016-08-02 07:46:26]

Patchset 1 (id:??) landed as
https://crrev.com/a758144329b7ddda258e41ea5d8abfca8595e34c
Cr-Commit-Position: refs/heads/master@{#38231}