Revert of ES6 computed property names

Revert of ES6 computed property names (patchset #1 id:1 of https://codereview.chromium.org/792233008/)

Reason for revert:
[sheriff] Still crashes on win32 (XP):
http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%201/builds/1380

Original issue's description:
> ES6 computed property names
>
> This adds support for computed property names, under the flag
> --harmony-computed-property-names, for both object literals and
> classes.
>
> This is a revert of the revert, a76419f0f497db156eb1010e9b4be398951280cb.
>
> This changes to do an early bailout in
> HOptimizedGraphBuilder::VisitObjectLiteral instead of doing that in the later
> loop.
>
> BUG=v8:3754
> LOG=Y
> TBR=dslomov@chromium.org

TBR=dslomov@chromium.org,arv@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=v8:3754
Committed: https://crrev.com/7d48fd9dc29c8f5d7c8b5215f9bd537cdd005eba
Cr-Commit-Position: refs/heads/master@{#25872}

[Michael Achenbach, 2014-12-17 19:46:34]

Created Revert of ES6 computed property names

[commit-bot: I haz the power, 2014-12-17 19:46:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/811593004/1

[commit-bot: I haz the power, 2014-12-17 19:47:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-18 18:05:07]

Patchset 1 (id:??) landed as
https://crrev.com/7d48fd9dc29c8f5d7c8b5215f9bd537cdd005eba
Cr-Commit-Position: refs/heads/master@{#25872}