[crankshaft] Fix deopt loop in String.fromCharCode on non-int32 inputs.

[crankshaft] Fix deopt loop in String.fromCharCode on non-int32 inputs.

The Crankshaft fast case for String.fromCharCode() unconditionally
deoptimizes on all non-int32 inputs, even tho it would be perfectly
valid to just truncate the index to an int32.

R=ishell@chromium.org
BUG=chromium:587068
LOG=n

Committed: https://crrev.com/6cc5c601b66e3ce95e66e16e4be9ac0c3b1ea433
Cr-Commit-Position: refs/heads/master@{#34243}

[Benedikt Meurer, 2016-02-24 10:36:46]

Hey Igor,

Simple fix for the deopt loop w/ String.fromCharCode.
Please take a look.

Thanks,
Benedikt

[Igor Sheludko, 2016-02-24 10:40:04]

lgtm

[Benedikt Meurer, 2016-02-24 10:40:17]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-02-24 10:40:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1727873003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1727873003/1

[commit-bot: I haz the power, 2016-02-24 10:59:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-24 10:59:59]

Description was changed from

==========
[crankshaft] Fix deopt loop in String.fromCharCode on non-int32 inputs.

The Crankshaft fast case for String.fromCharCode() unconditionally
deoptimizes on all non-int32 inputs, even tho it would be perfectly
valid to just truncate the index to an int32.

R=ishell@chromium.org
BUG=chromium:587068
LOG=n
==========

to

==========
[crankshaft] Fix deopt loop in String.fromCharCode on non-int32 inputs.

The Crankshaft fast case for String.fromCharCode() unconditionally
deoptimizes on all non-int32 inputs, even tho it would be perfectly
valid to just truncate the index to an int32.

R=ishell@chromium.org
BUG=chromium:587068
LOG=n

Committed: https://crrev.com/6cc5c601b66e3ce95e66e16e4be9ac0c3b1ea433
Cr-Commit-Position: refs/heads/master@{#34243}
==========

[commit-bot: I haz the power, 2016-02-24 11:00:00]

Patchset 1 (id:??) landed as
https://crrev.com/6cc5c601b66e3ce95e66e16e4be9ac0c3b1ea433
Cr-Commit-Position: refs/heads/master@{#34243}