[turbofan] Optimize ReferenceEqual based on input types.

[turbofan] Optimize ReferenceEqual based on input types.

We can constant-fold ReferenceEqual(a,b) to false, if the intersection
of the types of a and b is empty. This also repairs a regression in the
RestParameter performance test.

R=petermarshall@chromium.org
BUG=chromium:686668
Review-Url: https://codereview.chromium.org/2666543002
Cr-Commit-Position: refs/heads/master@{#42775}
Committed: https://chromium.googlesource.com/v8/v8/+/0b1b8c77a040a4379192a3168c97b4ce4645d54f

[Benedikt Meurer, 2017-01-30 12:12:03]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-30 12:12:14]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[petermarshall, 2017-01-30 12:20:34]

LGTM! Thanks

[commit-bot: I haz the power, 2017-01-30 12:43:15]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-01-30 12:43:15]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2017-01-30 13:12:33]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-01-30 13:12:43]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-30 13:14:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485781953842470, "parent_rev":
"db57a119797153aee88ff3df9fe3d87af71b4cb8", "commit_rev":
"0b1b8c77a040a4379192a3168c97b4ce4645d54f"}

[commit-bot: I haz the power, 2017-01-30 13:14:43]

Description was changed from

==========
[turbofan] Optimize ReferenceEqual based on input types.

We can constant-fold ReferenceEqual(a,b) to false, if the intersection
of the types of a and b is empty. This also repairs a regression in the
RestParameter performance test.

R=petermarshall@chromium.org
BUG=chromium:686668
==========

to

==========
[turbofan] Optimize ReferenceEqual based on input types.

We can constant-fold ReferenceEqual(a,b) to false, if the intersection
of the types of a and b is empty. This also repairs a regression in the
RestParameter performance test.

R=petermarshall@chromium.org
BUG=chromium:686668

Review-Url: https://codereview.chromium.org/2666543002
Cr-Commit-Position: refs/heads/master@{#42775}
Committed:
https://chromium.googlesource.com/v8/v8/+/0b1b8c77a040a4379192a3168c97b4ce464...
==========

[commit-bot: I haz the power, 2017-01-30 13:14:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/0b1b8c77a040a4379192a3168c97b4ce464...