* gc.c (rb_objspace::profile): rename rb_objspace::profile::record to
  records (because it points a set of records) and add a field
  rb_objspace::profile::current_record to point a current profiling
  record.
* gc.c: use above fields.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41551 b2dd03c8-39d4-4d8f-98ff-823fe69b080e