[turbofan] Add new StringFromCharCode simplified operator.

[turbofan] Add new StringFromCharCode simplified operator.

We use StringFromCharCode to optimize calls to String.fromCharCode with
a single Number argument for now. We will use it to also implement the
charAt method on the String prototype.

R=jarin@chromium.org

Committed: https://crrev.com/5a3a6dafae9cebf036021bbf65cab58711e21fba
Cr-Commit-Position: refs/heads/master@{#36668}

[Benedikt Meurer, 2016-06-02 07:15:53]

Hey Jaro,

Initial support for String.fromCharCode in TurboFan.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-06-02 07:32:35]

lgtm

[Benedikt Meurer, 2016-06-02 07:33:23]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-06-02 07:33:23]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/2037453003/#ps20001
(title: "Mitigate verifier blowup after early optimization.")

[commit-bot: I haz the power, 2016-06-02 07:33:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2037453003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2037453003/20001

[commit-bot: I haz the power, 2016-06-02 07:59:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-02 08:01:53]

Description was changed from

==========
[turbofan] Add new StringFromCharCode simplified operator.

We use StringFromCharCode to optimize calls to String.fromCharCode with
a single Number argument for now. We will use it to also implement the
charAt method on the String prototype.

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

to

==========
[turbofan] Add new StringFromCharCode simplified operator.

We use StringFromCharCode to optimize calls to String.fromCharCode with
a single Number argument for now. We will use it to also implement the
charAt method on the String prototype.

R=jarin@chromium.org

Committed: https://crrev.com/5a3a6dafae9cebf036021bbf65cab58711e21fba
Cr-Commit-Position: refs/heads/master@{#36668}
==========

[commit-bot: I haz the power, 2016-06-02 08:01:54]

Patchset 2 (id:??) landed as
https://crrev.com/5a3a6dafae9cebf036021bbf65cab58711e21fba
Cr-Commit-Position: refs/heads/master@{#36668}