ES6 computed property names

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, 7d48fd9dc29c8f5d7c8b5215f9bd537cdd005eba.

BUG=v8:3754
LOG=Y
R=dslomov@chromium.org

Committed: https://crrev.com/74e38e34b3caecfb660c3ed1336a58c551215793
Cr-Commit-Position: refs/heads/master@{#26084}

[arv (Not doing code reviews), 2015-01-15 17:31:29]

Move back the bailout into the loop

[arv (Not doing code reviews), 2015-01-15 17:35:19]

Disable test on windows

[arv (Not doing code reviews), 2015-01-15 17:37:15]

PTAL

Patchset 0 is a straight revert of the revert.

[Dmitry Lomov (no reviews), 2015-01-15 19:03:14]

lgtm (rubberstamped)

[arv (Not doing code reviews), 2015-01-15 19:34:56]

The CQ bit was checked by arv@chromium.org

[commit-bot: I haz the power, 2015-01-15 19:35:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/798243004/40001

[commit-bot: I haz the power, 2015-01-15 20:02:30]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-15 20:02:48]

Patchset 3 (id:??) landed as
https://crrev.com/74e38e34b3caecfb660c3ed1336a58c551215793
Cr-Commit-Position: refs/heads/master@{#26084}