[turbofan] Propagate word32 truncations through tagged-hole checks.

[turbofan] Propagate word32 truncations through tagged-hole checks.

If all uses of a CheckTaggedHole[convert-hole-to-undefined] node
truncate to word32, we can replace the hole check with a Smi check
and return the result as word32.

R=jarin@chromium.org

Committed: https://crrev.com/61386fb82d82ad31969ec699eb4433eec502f04e
Cr-Commit-Position: refs/heads/master@{#37142}

[Benedikt Meurer, 2016-06-21 09:49:52]

Hey Jaro,

This fixes the first hole-check in Octane crypto.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-06-21 11:07:52]

lgtm

[Benedikt Meurer, 2016-06-21 12:27:03]

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

[commit-bot: I haz the power, 2016-06-21 12:27:09]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2079233006/1

[commit-bot: I haz the power, 2016-06-21 12:31:54]

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

[commit-bot: I haz the power, 2016-06-21 12:31:55]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2016-06-21 12:41:47]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-06-21 12:41:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2079233006/1

[commit-bot: I haz the power, 2016-06-21 12:43:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-21 12:45:30]

Description was changed from

==========
[turbofan] Propagate word32 truncations through tagged-hole checks.

If all uses of a CheckTaggedHole[convert-hole-to-undefined] node
truncate to word32, we can replace the hole check with a Smi check
and return the result as word32.

R=jarin@chromium.org
==========

to

==========
[turbofan] Propagate word32 truncations through tagged-hole checks.

If all uses of a CheckTaggedHole[convert-hole-to-undefined] node
truncate to word32, we can replace the hole check with a Smi check
and return the result as word32.

R=jarin@chromium.org

Committed: https://crrev.com/61386fb82d82ad31969ec699eb4433eec502f04e
Cr-Commit-Position: refs/heads/master@{#37142}
==========

[commit-bot: I haz the power, 2016-06-21 12:45:31]

Patchset 1 (id:??) landed as
https://crrev.com/61386fb82d82ad31969ec699eb4433eec502f04e
Cr-Commit-Position: refs/heads/master@{#37142}