* spec/rubyspec/core/kernel/itself_spec.rb: `object_id` may return
different objects for each calls, and the expectation of object
identity is done by `equal` matcher which uses `equal?` method.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58704 b2dd03c8-39d4-4d8f-98ff-823fe69b080e