[turbofan] Improve memory layout of Node class.

[turbofan] Improve memory layout of Node class.

Also gets rid of the reinterpret_cast on this.

R=svenpanne@chromium.org

Committed: https://crrev.com/f91e8046fad99365c74ccbb39d42de58398dab57
Cr-Commit-Position: refs/heads/master@{#26103}

[Benedikt Meurer, 2015-01-16 12:06:55]

PTAL

[dcarney, 2015-01-16 12:46:27]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-01-16 12:46:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/828803004/1

[commit-bot: I haz the power, 2015-01-16 12:46:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-01-16 12:46:36]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[dcarney, 2015-01-16 12:47:27]

The CQ bit was checked by dcarney@chromium.org

[dcarney, 2015-01-16 12:47:28]

lgtm

[commit-bot: I haz the power, 2015-01-16 12:48:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/828803004/1

[Sven Panne, 2015-01-16 12:50:38]

LGTM, although this is very interesting code, for a certain definition of
"interesting"... o_O

[commit-bot: I haz the power, 2015-01-16 13:16:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-16 13:16:52]

Patchset 1 (id:??) landed as
https://crrev.com/f91e8046fad99365c74ccbb39d42de58398dab57
Cr-Commit-Position: refs/heads/master@{#26103}

[Michael Achenbach, 2015-01-16 16:49:19]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/856813003/ by machenbach@chromium.org.

The reason for reverting is: Speculative revert to see if win XP recovers. Will
reland if not..