[turbofan] Do not generate unnecessary moves when casting a tagged value to a word.

[turbofan] Do not generate unnecessary moves when casting a tagged value to a word.

We currently use BitcastTaggedToWord only in from the code assemblers to verify the correctness of the operation.

BUG=

Review-Url: https://codereview.chromium.org/2605073002
Cr-Commit-Position: refs/heads/master@{#41979}
Committed: https://chromium.googlesource.com/v8/v8/+/6f62fd3d83bda3ec9378b424809e0fac03507138

[epertoso, 2016-12-28 16:55:24]

epertoso@chromium.org changed reviewers:
+ danno@chromium.org

[epertoso, 2016-12-28 16:56:50]

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

[commit-bot: I haz the power, 2016-12-28 16:56:58]

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

[danno, 2016-12-28 17:00:32]

lgtm

[commit-bot: I haz the power, 2016-12-28 17:21:18]

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

[commit-bot: I haz the power, 2016-12-28 17:21:19]

Dry run: This issue passed the CQ dry run.

[danno, 2016-12-28 17:25:03]

The CQ bit was checked by danno@chromium.org

[commit-bot: I haz the power, 2016-12-28 17:25:11]

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, 2016-12-28 17:26:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482945903055220, "parent_rev":
"e0f97ebb32d3bd3f5f94927f81717e7ee8b0a7d3", "commit_rev":
"6f62fd3d83bda3ec9378b424809e0fac03507138"}

[commit-bot: I haz the power, 2016-12-28 17:26:46]

Description was changed from

==========
[turbofan] Do not generate unnecessary moves when casting a tagged value to a
word.

We currently use BitcastTaggedToWord only in from the code assemblers to verify
the correctness of the operation.

BUG=
==========

to

==========
[turbofan] Do not generate unnecessary moves when casting a tagged value to a
word.

We currently use BitcastTaggedToWord only in from the code assemblers to verify
the correctness of the operation.

BUG=

Review-Url: https://codereview.chromium.org/2605073002
Cr-Commit-Position: refs/heads/master@{#41979}
Committed:
https://chromium.googlesource.com/v8/v8/+/6f62fd3d83bda3ec9378b424809e0fac035...
==========

[commit-bot: I haz the power, 2016-12-28 17:26:47]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/6f62fd3d83bda3ec9378b424809e0fac035...