X87: ES6 computed property names

X87: ES6 computed property names

port 74e38e34b3caecfb660c3ed1336a58c551215793.

original commit message:

   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=
R=weiliang.lin@intel.com

Committed: https://chromium.googlesource.com/v8/v8/+/1b3490adab88c3b0a17e87bb306432aa7112b896

[chunyang.dai, 2015-01-16 05:10:33]

chunyang.dai@intel.com changed reviewers:
+ arv@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2015-01-16 05:10:48]

WL.
PTAL.
thanks

[Weiliang, 2015-01-16 05:16:01]

lgtm

[commit-bot: I haz the power, 2015-01-16 05:25:25]

Patchset 1 (id:??) landed as
https://crrev.com/1b3490adab88c3b0a17e87bb306432aa7112b896
Cr-Commit-Position: refs/heads/master@{#26090}

[chunyang.dai, 2015-01-16 05:25:29]

Committed patchset #1 (id:1) manually as
1b3490adab88c3b0a17e87bb306432aa7112b896 (presubmit successful).