PR tree-optimization/56205
	* tree-stdarg.c (check_all_va_list_escapes): Return true if
	there are any PHI nodes that set non-va_list_escape_vars SSA_NAME
	and some va_list_escape_vars SSA_NAME appears in some PHI argument.

	* gcc.dg/tree-ssa/stdarg-6.c: New test.
	* gcc.c-torture/execute/pr56205.c: New test.

From-SVN: r195760