Arrow functions: Cleanup handling of the prototype property

Arrow functions: Cleanup handling of the prototype property

The old code did not work correctly in case of optimizations. I
found this out when implementing concise methods and we now plumb
through the function kind so we know what kind of Map to create for
the function.

BUG=v8:2700
LOG=y
R=rossberg@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23920

[arv (Not doing code reviews), 2014-09-11 16:21:54]

arv@chromium.org changed reviewers:
+ aperez@igalia.com, rossberg@chromium.org

[aperez, 2014-09-12 02:37:08]

On 2014/09/11 16:21:55, arv wrote:

Looks good to me.

[rossberg, 2014-09-12 12:29:16]

lgtm

[arv (Not doing code reviews), 2014-09-12 15:07:59]

Committed patchset #2 (id:20001) manually as 23920 (presubmit successful).