re PR middle-end/34934 (-O1 crash compile *** glibc detected *** /usr/lib/gcc/i486-linux-gnu/4.2.3/cc1: double free or corruption (!prev))

	PR middle-end/34934
	* tree-stdarg.c (reachable_at_most_once): Use VEC vector instead of
	a fixed vector for stack.

	* gcc.c-torture/compile/20080124-1.c: New test.

From-SVN: r131780