[turbofan] Remove ineffective optimization from ControlReducer.

[turbofan] Remove ineffective optimization from ControlReducer.

This optimization just duplicates part of the ToBoolean rule in the
Typer, and it doesn't make sense to have adhoc partial typing rules in
the ControlReducer anyway.

R=jarin@chromium.org

Committed: https://crrev.com/ad6e7391653d3cd7a899634948ec7cebead2600c
Cr-Commit-Position: refs/heads/master@{#29064}

[Benedikt Meurer, 2015-06-17 05:21:30]

Hey Jaro,

Removing dead code. Please take a look.

Thanks,
Benedikt

[Jarin, 2015-06-17 05:35:14]

lgtm (once you fix/remove the test).

[Benedikt Meurer, 2015-06-17 05:42:06]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-06-17 05:42:07]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/1189963002/#ps20001
(title: "Remove bogus tests.")

[commit-bot: I haz the power, 2015-06-17 05:42:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1189963002/20001

[commit-bot: I haz the power, 2015-06-17 06:11:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-17 06:12:01]

Patchset 2 (id:??) landed as
https://crrev.com/ad6e7391653d3cd7a899634948ec7cebead2600c
Cr-Commit-Position: refs/heads/master@{#29064}