[turbofan] Optimize strict equality of unique values.

[turbofan] Optimize strict equality of unique values.

If both inputs to JSStrictEqual/JSStrictNotEqual are unique values (i.e.
values with a canonical representation), we can lower the comparison to
ReferenceEqual instead of StringEqual or CompareIC.

Committed: https://crrev.com/b66226a9d93f3151773a823748c5cdb20dd8c153
Cr-Commit-Position: refs/heads/master@{#28646}

[Benedikt Meurer, 2015-05-27 04:13:07]

bmeurer@chromium.org changed reviewers:
+ jarin@chromium.org

[Benedikt Meurer, 2015-05-27 04:13:07]

Hey Jaro,

Trivial optimization for strict equal. Please take a look.

Thanks,
Benedikt

[Jarin, 2015-05-27 04:21:25]

lgtm

[Benedikt Meurer, 2015-05-27 04:21:31]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-05-27 04:21:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1154303002/1

[commit-bot: I haz the power, 2015-05-27 04:23:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-27 04:23:47]

Patchset 1 (id:??) landed as
https://crrev.com/b66226a9d93f3151773a823748c5cdb20dd8c153
Cr-Commit-Position: refs/heads/master@{#28646}