[swfinterp] Correct array access

test/swftests/ArrayAccess.as

@@ -0,0 +1,19 @@
+// input: [["a", "b", "c", "d"]]
+// output: ["c", "b", "a", "d"]
+
+package {
+public class ArrayAccess {
+    public static function main(ar:Array):Array {
+    	var aa:ArrayAccess = new ArrayAccess();
+    	return aa.f(ar, 2);
+    }
+
+    private function f(ar:Array, num:Number):Array{
+        var x:String = ar[0];
+        var y:String = ar[num % ar.length];
+        ar[0] = y;
+        ar[num] = x;
+        return ar;
+    }
+}
+}