[turbofan] Turn common Guard operator into simplified TypeGuard.

[turbofan] Turn common Guard operator into simplified TypeGuard.

The type guard should never be used after the effect/control
linearization pass, so making it a simplified operator better
expresses the intended use. Also this way none of the common
operators actually has any dependency on the type system.

Drive-by-fix: Properly print the type parameter to a TypeGuard operator.

BUG=chromium:612142
R=jarin@chromium.org

Committed: https://crrev.com/c5a71f029fb554c6a79a9226a99258c12751bd9b
Cr-Commit-Position: refs/heads/master@{#36304}

[Benedikt Meurer, 2016-05-18 05:44:17]

Hey Jaro,

Follow up cleanup to make sure no one misuses Guard nodes (or at least make it
hard enough that people will notice they are holding it wrong).
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-05-18 05:47:50]

lgtm

[Benedikt Meurer, 2016-05-18 05:49:31]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-05-18 05:49:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1994503002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1994503002/1

[commit-bot: I haz the power, 2016-05-18 06:19:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-18 06:19:39]

Description was changed from

==========
[turbofan] Turn common Guard operator into simplified TypeGuard.

The type guard should never be used after the effect/control
linearization pass, so making it a simplified operator better
expresses the intended use. Also this way none of the common
operators actually has any dependency on the type system.

Drive-by-fix: Properly print the type parameter to a TypeGuard operator.

BUG=chromium:612142
R=jarin@chromium.org
==========

to

==========
[turbofan] Turn common Guard operator into simplified TypeGuard.

The type guard should never be used after the effect/control
linearization pass, so making it a simplified operator better
expresses the intended use. Also this way none of the common
operators actually has any dependency on the type system.

Drive-by-fix: Properly print the type parameter to a TypeGuard operator.

BUG=chromium:612142
R=jarin@chromium.org

Committed: https://crrev.com/c5a71f029fb554c6a79a9226a99258c12751bd9b
Cr-Commit-Position: refs/heads/master@{#36304}
==========

[commit-bot: I haz the power, 2016-05-18 06:19:40]

Patchset 1 (id:??) landed as
https://crrev.com/c5a71f029fb554c6a79a9226a99258c12751bd9b
Cr-Commit-Position: refs/heads/master@{#36304}