Unreviewed, rolling out r192416 and r192443.

Unreviewed, rolling out r192416 and r192443.
https://bugs.webkit.org/show_bug.cgi?id=151285

Broke 32-bit in some mysterious way I need to understand
(Requested by kling on #webkit).

Reverted changesets:

"[JSC] JSPropertyNameEnumerator could be destructorless."
https://bugs.webkit.org/show_bug.cgi?id=151242
http://trac.webkit.org/changeset/192416

"Follow-up for 32-bit test failures after..."
https://bugs.webkit.org/show_bug.cgi?id=151242
http://trac.webkit.org/changeset/192443

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@192453 268f45cc-cd09-0410-ab3c-d52691b4dbfc