Revert of [turbofan] Improve memory layout of Node class.

Revert of [turbofan] Improve memory layout of Node class. (patchset #1 id:1 of https://codereview.chromium.org/828803004/)

Reason for revert:
Speculative revert to see if win XP recovers. Will reland if not.

Original issue's description:
> [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}

TBR=svenpanne@chromium.org,dcarney@chromium.org,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/dc6f34d83650dce8faa3e82e87c050f12732d4b3
Cr-Commit-Position: refs/heads/master@{#26106}

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

Created Revert of [turbofan] Improve memory layout of Node class.

[commit-bot: I haz the power, 2015-01-16 16:49:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/856813003/1

[commit-bot: I haz the power, 2015-01-16 16:50:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-16 16:50:19]

Patchset 1 (id:??) landed as
https://crrev.com/dc6f34d83650dce8faa3e82e87c050f12732d4b3
Cr-Commit-Position: refs/heads/master@{#26106}

[Michael Achenbach, 2015-01-16 19:17:26]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/855723002/ by machenbach@chromium.org.

The reason for reverting is: Revert didn't help..