[turbofan] Do strength reduction for ObjectIsSmi based on inputs.

[turbofan] Do strength reduction for ObjectIsSmi based on inputs.

Ideally we would have a dedicated MachineRepresentation for Smis during
representation selection and use that to properly optimize ObjectIsSmi
(and other ObjectIs<Type> predicates), but that will take some time to
get that done. So in the meantime we can just do simple (local) strength
reduction on ObjectIsSmi to avoid Smi checks in the simplest cases at
least.

R=jarin@chromium.org

Committed: https://crrev.com/c91c39611287475e806cb2aee1f60efd4de035fb
Cr-Commit-Position: refs/heads/master@{#36809}

[Jarin, 2016-06-08 05:09:52]

lgtm

[Benedikt Meurer, 2016-06-08 07:10:00]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-06-08 07:10:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2047213002/1

[commit-bot: I haz the power, 2016-06-08 07:11:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-08 07:13:10]

Description was changed from

==========
[turbofan] Do strength reduction for ObjectIsSmi based on inputs.

Ideally we would have a dedicated MachineRepresentation for Smis during
representation selection and use that to properly optimize ObjectIsSmi
(and other ObjectIs<Type> predicates), but that will take some time to
get that done. So in the meantime we can just do simple (local) strength
reduction on ObjectIsSmi to avoid Smi checks in the simplest cases at
least.

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

to

==========
[turbofan] Do strength reduction for ObjectIsSmi based on inputs.

Ideally we would have a dedicated MachineRepresentation for Smis during
representation selection and use that to properly optimize ObjectIsSmi
(and other ObjectIs<Type> predicates), but that will take some time to
get that done. So in the meantime we can just do simple (local) strength
reduction on ObjectIsSmi to avoid Smi checks in the simplest cases at
least.

R=jarin@chromium.org

Committed: https://crrev.com/c91c39611287475e806cb2aee1f60efd4de035fb
Cr-Commit-Position: refs/heads/master@{#36809}
==========

[commit-bot: I haz the power, 2016-06-08 07:13:11]

Patchset 1 (id:??) landed as
https://crrev.com/c91c39611287475e806cb2aee1f60efd4de035fb
Cr-Commit-Position: refs/heads/master@{#36809}