* iseq.c (get_insn_info_succinct_bitvector): If
  VM_CHECK_MODE is 0, `body->insns_info.positions` is
  freed in `rb_iseq_insns_info_encode_positions`.
  Print `position` only when VM_CHECK_MODE is set.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e