[turbofan] Introduce ObjectIsString operator.

[turbofan] Introduce ObjectIsString operator.

This adds an ObjectIsString operator and hooks it up with
JSNativeContextSpecialization (to remove the use of some machine
operators there).

R=jarin@chromium.org

Committed: https://crrev.com/2742b303b8e470689b41e0dad1c36ea49c7cc74b
Cr-Commit-Position: refs/heads/master@{#35525}

[Jarin, 2016-04-15 12:04:56]

lgtm.

[Benedikt Meurer, 2016-04-15 12:07:07]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-04-15 12:07:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1894523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1894523002/1

[commit-bot: I haz the power, 2016-04-15 12:35:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-15 12:37:46]

Description was changed from

==========
[turbofan] Introduce ObjectIsString operator.

This adds an ObjectIsString operator and hooks it up with
JSNativeContextSpecialization (to remove the use of some machine
operators there).

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

to

==========
[turbofan] Introduce ObjectIsString operator.

This adds an ObjectIsString operator and hooks it up with
JSNativeContextSpecialization (to remove the use of some machine
operators there).

R=jarin@chromium.org

Committed: https://crrev.com/2742b303b8e470689b41e0dad1c36ea49c7cc74b
Cr-Commit-Position: refs/heads/master@{#35525}
==========

[commit-bot: I haz the power, 2016-04-15 12:37:47]

Patchset 1 (id:??) landed as
https://crrev.com/2742b303b8e470689b41e0dad1c36ea49c7cc74b
Cr-Commit-Position: refs/heads/master@{#35525}