Add MethodHandleFacade instances for calls up to arity 22

[markehammons]

The MethodHandleFacade allows Slinc to call invoke on method handles. Right now, Slinc tries to call the specialized versions created by the generator, followed by a specific arity, followed by a variadic call. The variadic call is the worst case performance. Right now only up to arity 4 is defined for MethodHandleFacade. Add instances for up to arity 22.