[turbofan] Initial attempt to cleanup Node and related classes.

[turbofan] Initial attempt to cleanup Node and related classes.

- Make Node::Inputs and Node::Uses mostly STL compliant.
- Get rid of some pre-C++11 crappiness.
- Start moving unit tests from cctest to unittests.
- TrimInputCount() now tries to reserve inputs slots for
  later appending.
- Fix numerous style guide violations.

TEST=cctest,unittests
R=dcarney@chromium.org

Committed: https://crrev.com/835cc463a8c8c50b812224c5f246164d30066da2
Cr-Commit-Position: refs/heads/master@{#26098}

[Benedikt Meurer, 2015-01-16 10:12:14]

PTAL

[dcarney, 2015-01-16 10:28:09]

The CQ bit was checked by dcarney@chromium.org

[dcarney, 2015-01-16 10:28:10]

lgtm

[commit-bot: I haz the power, 2015-01-16 10:28:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/851263002/1

[commit-bot: I haz the power, 2015-01-16 11:04:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-16 11:04:33]

Patchset 1 (id:??) landed as
https://crrev.com/835cc463a8c8c50b812224c5f246164d30066da2
Cr-Commit-Position: refs/heads/master@{#26098}