ES6: Tighten up Object.prototype.__proto__

ES6: Tighten up Object.prototype.__proto__

The spec requires that we throw under certain conditions.

BUG=v8:3064
LOG=y
R=rossberg@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19479

[arv (Not doing code reviews), 2013-12-19 21:09:47]

This depends on https://codereview.chromium.org/103343005/

[arv (Not doing code reviews), 2014-02-06 20:10:21]

This is ready for review now that the poison pill on the setter has been
removed.

Thanks

[arv (Not doing code reviews), 2014-02-07 15:14:39]

All these tests pass in IE11 (after removing Symbol tests)

SpiderMonkey has some minor issues.

https://bugzilla.mozilla.org/show_bug.cgi?id=969402

I also filed a spec bug, since it makes little sense to have the setter return
the value.

https://bugs.ecmascript.org/show_bug.cgi?id=2511

[rossberg, 2014-02-18 17:11:38]

LGTM, will land it tomorrow

[arv (Not doing code reviews), 2014-02-18 17:56:43]

On 2014/02/18 17:11:38, rossberg wrote:
> LGTM, will land it tomorrow

I was hoping the bug would get resolved before this landed.

I escalated the bug by posting to es-discuss.

Please hold off a little longer.

[arv (Not doing code reviews), 2014-02-18 18:45:23]

On 2014/02/18 17:56:43, arv wrote:
> On 2014/02/18 17:11:38, rossberg wrote:
> > LGTM, will land it tomorrow
> 
> I was hoping the bug would get resolved before this landed.
> 
> I escalated the bug by posting to es-discuss.
> 
> Please hold off a little longer.

Allen changed it to return undefined (as I wanted). I'll upload a new patch.

[arv (Not doing code reviews), 2014-02-18 20:15:22]

Updated to return undefined

[rossberg, 2014-02-19 11:59:13]

Committed patchset #5 manually as r19479 (presubmit successful).