* gc.c (free_method_cache_entry_i): unused function

* gc.c (rb_free_mc_table): ditto

* internal.h (method_cache_entry_t): unused struct

* vm_method.c (verify_method_cache): remove unused variable

* vm_method.c (rb_method_entry): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43028 b2dd03c8-39d4-4d8f-98ff-823fe69b080e