[crankshaft] For-in index increment cannot overflow.

[crankshaft] For-in index increment cannot overflow.

The internal index used to implement for-in can never leave the
valid smi range, so there's no need to actually check for overflow
in Crankshaft. In fact the overflow only triggered a false alert
in the deopt fuzzer.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/c7d2adc0a28c7eb83bb0ce898235b760cb01d394
Cr-Commit-Position: refs/heads/master@{#33456}

[Benedikt Meurer, 2016-01-22 06:31:17]

Hey Jaro,

Here's the fix for the deopt fuzzer.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-01-22 07:52:53]

lgtm

[Benedikt Meurer, 2016-01-22 07:53:26]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-01-22 07:53:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1621623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1621623002/1

[commit-bot: I haz the power, 2016-01-22 07:54:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-22 07:55:15]

Description was changed from

==========
[crankshaft] For-in index increment cannot overflow.

The internal index used to implement for-in can never leave the
valid smi range, so there's no need to actually check for overflow
in Crankshaft. In fact the overflow only triggered a false alert
in the deopt fuzzer.

R=jarin@chromium.org
BUG=v8:3650
LOG=n
==========

to

==========
[crankshaft] For-in index increment cannot overflow.

The internal index used to implement for-in can never leave the
valid smi range, so there's no need to actually check for overflow
in Crankshaft. In fact the overflow only triggered a false alert
in the deopt fuzzer.

R=jarin@chromium.org
BUG=v8:3650
LOG=n

Committed: https://crrev.com/c7d2adc0a28c7eb83bb0ce898235b760cb01d394
Cr-Commit-Position: refs/heads/master@{#33456}
==========

[commit-bot: I haz the power, 2016-01-22 07:55:16]

Patchset 1 (id:??) landed as
https://crrev.com/c7d2adc0a28c7eb83bb0ce898235b760cb01d394
Cr-Commit-Position: refs/heads/master@{#33456}