[turbofan] Introduce PlainPrimitiveToNumber.

[turbofan] Introduce PlainPrimitiveToNumber.

This should solve the problem with missing checkpoints after JSToNumber
(PlainPrimitiveToNumber is marked no-write, so the frame-state
propagation should see through it.)

Unfortunately, this also duplicates the word32- and float64-truncation
magic that we have for JSToNumber in "simplified lowering".

Committed: https://crrev.com/2890137bdc421d1033a23827026ece89a54e7218
Cr-Commit-Position: refs/heads/master@{#36881}

[Jarin, 2016-06-10 07:06:27]

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

[Jarin, 2016-06-10 07:06:28]

Could you take a look, please?

[Benedikt Meurer, 2016-06-10 07:30:10]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-06-10 07:30:10]

lgtm

[commit-bot: I haz the power, 2016-06-10 07:30:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2059653002/20001

[commit-bot: I haz the power, 2016-06-10 07:41:53]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-10 07:45:30]

Description was changed from

==========
[turbofan] Introduce PlainPrimitiveToNumber.

This should solve the problem with missing checkpoints after JSToNumber
(PlainPrimitiveToNumber is marked no-write, so the frame-state
propagation should see through it.)

Unfortunately, this also duplicates the word32- and float64-truncation
magic that we have for JSToNumber in "simplified lowering".
==========

to

==========
[turbofan] Introduce PlainPrimitiveToNumber.

This should solve the problem with missing checkpoints after JSToNumber
(PlainPrimitiveToNumber is marked no-write, so the frame-state
propagation should see through it.)

Unfortunately, this also duplicates the word32- and float64-truncation
magic that we have for JSToNumber in "simplified lowering".

Committed: https://crrev.com/2890137bdc421d1033a23827026ece89a54e7218
Cr-Commit-Position: refs/heads/master@{#36881}
==========

[commit-bot: I haz the power, 2016-06-10 07:45:31]

Patchset 2 (id:??) landed as
https://crrev.com/2890137bdc421d1033a23827026ece89a54e7218
Cr-Commit-Position: refs/heads/master@{#36881}