[turbofan] Eliminate redundant ChangeTaggedSignedToInt32.

[turbofan] Eliminate redundant ChangeTaggedSignedToInt32.

Apply the same strength reduction to the ChangeTaggedSignedToInt32
operator that we already have for ChangeTaggedToInt32.

R=epertoso@chromium.org

Committed: https://crrev.com/4386dfeee0403d3348df9ccca2be596810fccc92
Cr-Commit-Position: refs/heads/master@{#40352}

[Benedikt Meurer, 2016-10-17 09:31:41]

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

[commit-bot: I haz the power, 2016-10-17 09:31:47]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Benedikt Meurer, 2016-10-17 09:32:20]

Hey Enrico,

Here's a very simple one-liner.
Please take a look.

Thanks,
Benedikt

[epertoso, 2016-10-17 09:53:50]

lgtm

[commit-bot: I haz the power, 2016-10-17 09:59:18]

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

[commit-bot: I haz the power, 2016-10-17 09:59:19]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2016-10-17 10:07:25]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-10-17 10:07:38]

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, 2016-10-17 10:14:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-17 10:15:13]

Description was changed from

==========
[turbofan] Eliminate redundant ChangeTaggedSignedToInt32.

Apply the same strength reduction to the ChangeTaggedSignedToInt32
operator that we already have for ChangeTaggedToInt32.

R=epertoso@chromium.org
==========

to

==========
[turbofan] Eliminate redundant ChangeTaggedSignedToInt32.

Apply the same strength reduction to the ChangeTaggedSignedToInt32
operator that we already have for ChangeTaggedToInt32.

R=epertoso@chromium.org

Committed: https://crrev.com/4386dfeee0403d3348df9ccca2be596810fccc92
Cr-Commit-Position: refs/heads/master@{#40352}
==========

[commit-bot: I haz the power, 2016-10-17 10:15:14]

Patchset 1 (id:??) landed as
https://crrev.com/4386dfeee0403d3348df9ccca2be596810fccc92
Cr-Commit-Position: refs/heads/master@{#40352}