Ruby

Cannot call rb_thread_call_with{out,}_gvl before running VM

• dir.c (opendir_without_gvl, with_gvl_gc_for_fd, opendir_at): check the VM is
  already initialized before calling rb_thread_call_with{out,}_gvl().
  [Bug #14115]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60837 b2dd03c8-39d4-4d8f-98ff-823fe69b080e