rename variables

* vm.c (vm_collect_local_variables_in_heap): rename an argument.

* vm_eval.c (rb_f_local_variables): rename a local variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45848 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-05-07

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e