X87: Fix issue with __proto__ when using ES6 object literals.

X87: Fix issue with __proto__ when using ES6 object literals.

port bc3b2960e3b7abc16440717f289a430aef904cb1 (r26172).

original commit message:
  Fix issue with __proto__ when using ES6 object literals

  It should be possible to create a concise method with the name
  __proto__ without setting the [[Prototype]]. Similarly, property
  name shorthands with the name __proto__ should define an own
  property.

BUG=
R=weiliang.lin@intel.com

Committed: https://chromium.googlesource.com/v8/v8/+/3175d302495ede827e2912656c791acf1440e669

[chunyang.dai, 2015-01-21 07:53:00]

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

[chunyang.dai, 2015-01-21 07:53:14]

WL
PTAL.
thanks

[Weiliang, 2015-01-21 08:11:50]

lgtm

[commit-bot: I haz the power, 2015-01-21 08:31:33]

Patchset 1 (id:??) landed as
https://crrev.com/3175d302495ede827e2912656c791acf1440e669
Cr-Commit-Position: refs/heads/master@{#26179}

[chunyang.dai, 2015-01-21 08:31:39]

Committed patchset #1 (id:1) manually as
3175d302495ede827e2912656c791acf1440e669 (presubmit successful).

[arv (Not doing code reviews), 2015-01-21 15:07:14]

LGTM