Fix breakage from earlier plperl fix.

Apparently the perl garbage collector was a bit too eager, so here
we control when the new SV is garbage collected.

Branch
------
REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/d1d836f92c0798f4bc4138dc6b87279199c4f49a

Modified Files
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src/pl/plperl/plperl_helpers.h |   23 +++++++++++++++--------
1 files changed, 15 insertions(+), 8 deletions(-)

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Next:	From: Andrew Dunstan	Date: 2012-01-05 23:02:48
	Subject: pgsql: Fix breakage from earlier plperl fix.
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	Subject: Re: [COMMITTERS] pgsql: Work around perl bug in SvPVutf8().