MIPS: ES6 computed property names.

MIPS: 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=v8:3754
LOG=Y

Committed: https://crrev.com/966dad071af11d08d175da07d9c5cc88d293554e
Cr-Commit-Position: refs/heads/master@{#26088}

[paul.l..., 2015-01-16 01:33:55]

paul.lind@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, arv@chromium.org, balazs.kilvady@imgtec.com,
danno@chromium.org, dusan.milosavljevic@imgtec.com, gergely.kis@imgtec.com

[paul.l..., 2015-01-16 01:33:56]

PTAL.

[arv (Not doing code reviews), 2015-01-16 01:47:36]

LGTM

[paul.l..., 2015-01-16 01:57:26]

The CQ bit was checked by paul.lind@imgtec.com

[commit-bot: I haz the power, 2015-01-16 01:57:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/829913005/1

[commit-bot: I haz the power, 2015-01-16 04:42:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-16 04:42:44]

Patchset 1 (id:??) landed as
https://crrev.com/966dad071af11d08d175da07d9c5cc88d293554e
Cr-Commit-Position: refs/heads/master@{#26088}