re PR tree-optimization/22171 (gcc-4.0-20050623 internal compiler error in linux/drivers/serial/8250.c)

	PR 22171
	* tree-ssa-operands.c (get_expr_operands): Check s_ann for NULL
	before use.

	PR 22171
	* gcc.dg/tree-ssa/pr22171.c: New test.

From-SVN: r101292