vm_method.c: reuse method entry
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51645 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm_method.c: reuse method entry
instead of searching same entry repeatedly.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51645 b2dd03c8-39d4-4d8f-98ff-823fe69b080e