j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/function/overrideObject.kt

@@ -0,0 +1,26 @@
+// ERROR: Unresolved reference: clone
+class X {
+    override fun hashCode(): Int {
+        return super.hashCode()
+    }
+
+    override fun equals(o: Any?): Boolean {
+        return super.equals(o)
+    }
+
+    override fun toString(): String {
+        return super.toString()
+    }
+
+    throws(javaClass<CloneNotSupportedException>())
+    protected fun clone(): Any {
+        return super.clone()
+    }
+}
+
+class Y : Thread() {
+    throws(javaClass<CloneNotSupportedException>())
+    override fun clone(): Any {
+        return super.clone()
+    }
+}