[turbofan] Introduce ChangeTaggedToTaggedSigned operator.

[turbofan] Introduce ChangeTaggedToTaggedSigned operator.

We were missing a case for Tagged->TaggedSigned conversions when the
input type is known to be Type::SignedSmall.

BUG=chromium:687029
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2666863002
Cr-Commit-Position: refs/heads/master@{#42809}
Committed: https://chromium.googlesource.com/v8/v8/+/68ae57ce1e220196b73b7c9c031756421291a24f

[Benedikt Meurer, 2017-01-31 08:28:54]

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

[commit-bot: I haz the power, 2017-01-31 08:29:01]

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

[Jarin, 2017-01-31 08:33:28]

lgtm, thanks!

[Benedikt Meurer, 2017-01-31 08:47:20]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2017-01-31 08:47:26]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-01-31 08:47:29]

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, 2017-01-31 08:55:56]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485852446311540, "parent_rev":
"418c9eca799530ab19b9dd2d0eb24278669945b7", "commit_rev":
"68ae57ce1e220196b73b7c9c031756421291a24f"}

[commit-bot: I haz the power, 2017-01-31 08:56:00]

Description was changed from

==========
[turbofan] Introduce ChangeTaggedToTaggedSigned operator.

We were missing a case for Tagged->TaggedSigned conversions when the
input type is known to be Type::SignedSmall.

BUG=chromium:687029
R=jarin@chromium.org
==========

to

==========
[turbofan] Introduce ChangeTaggedToTaggedSigned operator.

We were missing a case for Tagged->TaggedSigned conversions when the
input type is known to be Type::SignedSmall.

BUG=chromium:687029
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2666863002
Cr-Commit-Position: refs/heads/master@{#42809}
Committed:
https://chromium.googlesource.com/v8/v8/+/68ae57ce1e220196b73b7c9c03175642129...
==========

[commit-bot: I haz the power, 2017-01-31 08:56:01]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/68ae57ce1e220196b73b7c9c03175642129...