Revert of Implement xorshift128+ for Math.random.

Revert of Implement xorshift128+ for Math.random. (patchset #6 id:100001 of https://codereview.chromium.org/1464303002/ )

Reason for revert:
Test failure: http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/491/steps/Mjsunit/logs/reflect-own-keys

Original issue's description:
> Implement xorshift128+ for Math.random.
>
> BUG=v8:4566
> LOG=N
>
> Committed: https://crrev.com/2755c5a1b1cf7fc4c5c614378e5231636e6dcff5
> Cr-Commit-Position: refs/heads/master@{#32200}

TBR=bmeurer@chromium.org,jkummerow@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4566
Committed: https://crrev.com/be22cdafc21a9cf4b3bb78aff6ed46a2827948a1
Cr-Commit-Position: refs/heads/master@{#32202}

[Yang, 2015-11-24 11:32:17]

Created Revert of Implement xorshift128+ for Math.random.

[commit-bot: I haz the power, 2015-11-24 11:32:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1475493003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1475493003/1

[commit-bot: I haz the power, 2015-11-24 11:32:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-24 11:32:49]

Patchset 1 (id:??) landed as
https://crrev.com/be22cdafc21a9cf4b3bb78aff6ed46a2827948a1
Cr-Commit-Position: refs/heads/master@{#32202}