title: Get all variables defined through `attr_accessor` without overriding `attr_accessor`
body: <p>I am setting some trace code on my program, and would like to know which methods are defined through <code>attr_accessor</code>. Using <code>TracePoint</code>, I can detect when <code>attr_accessor</code> is called, but I don't know how to get it to tell me the arguments it received. Any ideas? </p>