[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked truncation from a number or oddbal to a 32 bit word, which we were previously doing by concatenating a Smi to float64 conversion with a float64 to word32 truncation.

BUG=

Committed: https://crrev.com/43a86ff3b74c0fbc84bbe56a132f31db4b035240
Cr-Commit-Position: refs/heads/master@{#38091}

[epertoso, 2016-07-27 11:04:32]

Description was changed from

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

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

to

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

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

[epertoso, 2016-07-27 11:04:32]

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

[epertoso, 2016-07-27 11:04:33]

epertoso@chromium.org changed required reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2016-07-27 11:07:34]

Nice. LGTM.

[epertoso, 2016-07-27 11:14:59]

The CQ bit was checked by epertoso@chromium.org

[commit-bot: I haz the power, 2016-07-27 11:15:11]

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, 2016-07-27 11:38:19]

Description was changed from

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

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

to

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

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

[commit-bot: I haz the power, 2016-07-27 11:38:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-27 11:41:37]

Description was changed from

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

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

to

==========
[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

This leads to a better handling of the Smi case when we introduce a checked
truncation from a number or oddbal to a 32 bit word, which we were previously
doing by concatenating a Smi to float64 conversion with a float64 to word32
truncation.

BUG=

Committed: https://crrev.com/43a86ff3b74c0fbc84bbe56a132f31db4b035240
Cr-Commit-Position: refs/heads/master@{#38091}
==========

[commit-bot: I haz the power, 2016-07-27 11:41:38]

Patchset 1 (id:??) landed as
https://crrev.com/43a86ff3b74c0fbc84bbe56a132f31db4b035240
Cr-Commit-Position: refs/heads/master@{#38091}