[turbofan] Remove overly restrictive DCHECK.

[turbofan] Remove overly restrictive DCHECK.

The dead code elimination in SimplifiedLowering can eliminate pure nodes
if they don't have value uses. But some of those can indeed have control
inputs, i.e. Phi nodes do of course have a control input.

R=jarin@chromium.org
BUG=chromium:630923
Committed: https://crrev.com/e3e347b85ccdb6113e0a87272005fd8d7200bf0f
Cr-Commit-Position: refs/heads/master@{#37995}

[Benedikt Meurer, 2016-07-25 04:58:07]

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

[commit-bot: I haz the power, 2016-07-25 04:58:17]

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

[Jarin, 2016-07-25 04:59:10]

lgtm. Thanks!

[Benedikt Meurer, 2016-07-25 04:59:21]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2016-07-25 04:59:24]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-07-25 04:59:28]

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, 2016-07-25 05:21:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-25 05:22:29]

Description was changed from

==========
[turbofan] Remove overly restrictive DCHECK.

The dead code elimination in SimplifiedLowering can eliminate pure nodes
if they don't have value uses. But some of those can indeed have control
inputs, i.e. Phi nodes do of course have a control input.

R=jarin@chromium.org
BUG=chromium:630923
==========

to

==========
[turbofan] Remove overly restrictive DCHECK.

The dead code elimination in SimplifiedLowering can eliminate pure nodes
if they don't have value uses. But some of those can indeed have control
inputs, i.e. Phi nodes do of course have a control input.

R=jarin@chromium.org
BUG=chromium:630923

Committed: https://crrev.com/e3e347b85ccdb6113e0a87272005fd8d7200bf0f
Cr-Commit-Position: refs/heads/master@{#37995}
==========

[commit-bot: I haz the power, 2016-07-25 05:22:31]

Patchset 1 (id:??) landed as
https://crrev.com/e3e347b85ccdb6113e0a87272005fd8d7200bf0f
Cr-Commit-Position: refs/heads/master@{#37995}