[strong] Fix super in strong classes

[strong] Fix super in strong classes

The functions of strong classes are born non extensible. But, when
the class is created we need to add an own private symbol representing
the [[HomeObject]] slot in the spec.

Like for the hidden_string property, we allow adding private own
symbols to non extensible objects.

BUG=v8:4077
LOG=N
R=rossberg@chromium.org

Committed: https://crrev.com/55a7500343f5fe03b6da12ee5c7ef9761da8c269
Cr-Commit-Position: refs/heads/master@{#28447}

[arv (Not doing code reviews), 2015-05-14 20:48:49]

PTAL

Erik, FYI, your change to Isolate::IsInternallyUsedPropertyName works perfectly.

[arv (Not doing code reviews), 2015-05-14 23:39:18]

Enable super spread call tests

[arv (Not doing code reviews), 2015-05-14 23:40:51]

Enable super spread call tests

[arv (Not doing code reviews), 2015-05-14 23:41:00]

Patchset #2 (id:20001) has been deleted

[arv (Not doing code reviews), 2015-05-15 14:29:35]

Ping

[rossberg, 2015-05-18 13:45:06]

lgtm

[arv (Not doing code reviews), 2015-05-18 13:56:34]

The CQ bit was checked by arv@chromium.org

[commit-bot: I haz the power, 2015-05-18 13:56:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138603003/40001

[commit-bot: I haz the power, 2015-05-18 14:18:56]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-05-18 14:19:16]

Patchset 2 (id:??) landed as
https://crrev.com/55a7500343f5fe03b6da12ee5c7ef9761da8c269
Cr-Commit-Position: refs/heads/master@{#28447}