[turbofan] Fix invalid representation selection for Phis/Selects.

[turbofan] Fix invalid representation selection for Phis/Selects.

We cannot just blindly make a representation selection for Phi or Select
based on the truncations, but we also need to consider the type of the
inputs (or actually of the Phi/Select node itself). We can only use
Word32 representation based on Word32 truncation if the inputs are
Number or Oddball, same for Float64.

R=epertoso@chromium.org
BUG=v8:5255
Committed: https://crrev.com/c9324fe6c555ec12cef534d60f6b44d51cc9d961
Cr-Commit-Position: refs/heads/master@{#38241}

[Benedikt Meurer, 2016-08-02 11:32:51]

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

[commit-bot: I haz the power, 2016-08-02 11:32:59]

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 11:56:51]

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

[commit-bot: I haz the power, 2016-08-02 11:56:52]

Dry run: This issue passed the CQ dry run.

[epertoso, 2016-08-02 12:04:29]

lgtm

[Benedikt Meurer, 2016-08-02 12:08:15]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-08-02 12:08:23]

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 12:10:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-02 12:11:16]

Description was changed from

==========
[turbofan] Fix invalid representation selection for Phis/Selects.

We cannot just blindly make a representation selection for Phi or Select
based on the truncations, but we also need to consider the type of the
inputs (or actually of the Phi/Select node itself). We can only use
Word32 representation based on Word32 truncation if the inputs are
Number or Oddball, same for Float64.

R=epertoso@chromium.org
BUG=v8:5255
==========

to

==========
[turbofan] Fix invalid representation selection for Phis/Selects.

We cannot just blindly make a representation selection for Phi or Select
based on the truncations, but we also need to consider the type of the
inputs (or actually of the Phi/Select node itself). We can only use
Word32 representation based on Word32 truncation if the inputs are
Number or Oddball, same for Float64.

R=epertoso@chromium.org
BUG=v8:5255

Committed: https://crrev.com/c9324fe6c555ec12cef534d60f6b44d51cc9d961
Cr-Commit-Position: refs/heads/master@{#38241}
==========

[commit-bot: I haz the power, 2016-08-02 12:11:17]

Patchset 1 (id:??) landed as
https://crrev.com/c9324fe6c555ec12cef534d60f6b44d51cc9d961
Cr-Commit-Position: refs/heads/master@{#38241}