Fix bug in drcachesim's IS_POWER_OF_2()
Fix bug in drcachesim's IS_POWER_OF_2()

Review-URL: https://codereview.appspot.com/265050043

AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,code4bones/dynamorio