vm.c: narrow variable scope
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm.c: narrow variable scope
updated every time entering the block.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e