* method.h (rb_method_cfunc_t::invoker): add new field (func ptr)

  `invoker'. `invoker' function invoke cfunc body
  (rb_method_cfunc_t::func).
  `invoker' is set at method definition timing.
  With this change, the big `switch' (branch) in `call_cfunc()'
  is no longer needed.
  However, the performance benefit is only a bit.
* vm_core.h (rb_call_info_t::aux::func): add a new field to store
  cfunc body function pointer.
* vm_method.c (call_cfunc_invoker_func): add a new function which
  returns a suitable invoke function.
* vm_method.c (setup_method_cfunc_struct): added.
* vm_method.c (rb_add_method): fix to set `invoker'.
* vm_eval.c (vm_call0_body): catch up above changes.
* vm_insnhelper.c (call_cfunc): removed.
* vm_insnhelper.c (vm_call_cfunc): fix to call cfunc body
  with `invoker' function.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37268 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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