* bignum.c (MSB): New macro.
  (bary_unpack_internal): Use MSB.
  (bary_divmod): Ditto.
  (bigdivrem): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e