re PR tree-optimization/22171 (gcc-4.0-20050623 internal compiler error in…

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

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

From-SVN: r101293

gcc/tree-ssa-operands.c

@@ -1347,7 +1347,7 @@ get_expr_operands (tree stmt, tree *expr_p, int flags)
 	
 	if (code == COMPONENT_REF)
 	  {
-	    if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
+	    if (s_ann && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
 	      s_ann->has_volatile_ops = true; 
 	    get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
 	  }