[PATCH] Fix invalid code that breaks with GCC 4.9 -ftree-dse optimization

Patch from Niko Tyni:

This fixes SIGSEGVs at the start of the test suite when built with GCC-4.9 at -O2 (which includes -ftree-dse).

Quoting Richard Biener in https://gcc.gnu.org/PR62035 :

> so 'sv' is declared inside the 'else' but you make its address escape
> through the 'svp' variable declared in the outer block.

Bug-Debian: http://bugs.debian.org/754901

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1617680 13f79535-47bb-0310-9956-ffa450edef68