* bignum.c (BIGSIZE): New macro.
  (bigfixize): Use BIGSIZE.
  (big2ulong): Ditto.
  (check_shiftdown): Ditto.
  (rb_big_aref): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41461 b2dd03c8-39d4-4d8f-98ff-823fe69b080e