re PR tree-optimization/70948 (r235622 caused gcc.c-torture/execute/va-arg-pack-1.c execution failure AArch64)

2016-05-06  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70948
	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
	Properly clobber all fields of va_list for __builtin_va_start.

From-SVN: r235963