* bignum.c (big2str_orig): Simplified because RBIGNUM_LEN(x) <= 2 now.
  (big2str_struct): Two fields added: hbase2, hbase2_numdigits.
  (rb_big2str1): Initialize above fields.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42301 b2dd03c8-39d4-4d8f-98ff-823fe69b080e