[turbofan] Optimize %_IsJSReceiver based on input type.

[turbofan] Optimize %_IsJSReceiver based on input type.

We can constant fold %_IsJSReceiver(x) based on whether x is always a
receiver or can never be a receiver.  This is important as
%_IsJSReceiver is inserted by the JSInliner.

R=jarin@chromium.org
BUG=v8:4544
LOG=n

Committed: https://crrev.com/ddb9f461f1aea1df67bb87266b39653ed1b8a9eb
Cr-Commit-Position: refs/heads/master@{#32519}

[Benedikt Meurer, 2015-12-02 14:07:40]

Hey Jaro,

Here's a small one that gives us a nice 5% boost on Octane because load
elimination is more effective now.
Please take a look.

Thanks,
Benedikt

[Jarin, 2015-12-02 14:14:34]

Nice! lgtm.

[Benedikt Meurer, 2015-12-02 14:18:19]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-12-02 14:18:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1486383003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1486383003/1

[commit-bot: I haz the power, 2015-12-02 14:35:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-02 14:35:56]

Description was changed from

==========
[turbofan] Optimize %_IsJSReceiver based on input type.

We can constant fold %_IsJSReceiver(x) based on whether x is always a
receiver or can never be a receiver.  This is important as
%_IsJSReceiver is inserted by the JSInliner.

R=jarin@chromium.org
BUG=v8:4544
LOG=n
==========

to

==========
[turbofan] Optimize %_IsJSReceiver based on input type.

We can constant fold %_IsJSReceiver(x) based on whether x is always a
receiver or can never be a receiver.  This is important as
%_IsJSReceiver is inserted by the JSInliner.

R=jarin@chromium.org
BUG=v8:4544
LOG=n

Committed: https://crrev.com/ddb9f461f1aea1df67bb87266b39653ed1b8a9eb
Cr-Commit-Position: refs/heads/master@{#32519}
==========

[commit-bot: I haz the power, 2015-12-02 14:35:57]

Patchset 1 (id:??) landed as
https://crrev.com/ddb9f461f1aea1df67bb87266b39653ed1b8a9eb
Cr-Commit-Position: refs/heads/master@{#32519}