Fixed issue 1842: Safari 5 es5/3 using platform accessors in array-likes badly

On es5/3 on Safari 5, array-likes were implemented with platform
getters, but these properties were to be overridden with platform
assignment, which doesn't work for inherited accessor properties with
no setters. This adds a platform setter to such properties, allowing
override by platform assignment.

[MarkM, 2013-08-17 20:35:58]

On es5/3 on Safari 5, array-likes were implemented with platform
getters, but these properties were to be overridden with platform
assignment, which doesn't work for inherited accessor properties with
no setters. This adds a platform setter to such properties, allowing
override by platform assignment.

[ihab.awad, 2013-08-18 00:05:30]

lgtm++

[MarkM, 2013-08-18 01:23:46]

On es5/3 on Safari 5, array-likes were implemented with platform
getters, but these properties were to be overridden with platform
assignment, which doesn't work for inherited accessor properties with
no setters. This adds a platform setter to such properties, allowing
override by platform assignment.

[MarkM, 2013-08-18 01:27:56]

On 2013/08/18 00:05:30, ihab.awad wrote:
> lgtm++

(Ihab also let me know by chat that the comment was unclear.)

Done.