Recursive zval patch for review/comments

Hi,

I'm not quite sure about this patch. But this does bring back
up apc speed to pre recursive-zval levels.

http://t3.dotgnu.info/code/recursive-zval-mk2.patch

And somehow seems to fix a relatively random, but recurring
coredump (more on that on monday) with apc-cvs right now on
centos+apache1+x86.

I'm not quite sure of this patch - i.e is APCG(copied_zvals) allocated
in every scenario which could have a recursive alloc, is my assumption
about IS_ARRAY check before hitting copied_zvals right, etc.

Therefore, I'd like a couple more eyeballs on it - just to check
sanity, at least.

Cheers,
Gopal
-- 
If you have a difficult task, give it to a lazy person --
they will find an easier way to do it.
                             -- Hlade's Law