* bignum.c (bary_unpack): Extracted from rb_integer_unpack_internal.
  (absint_numwords_generic): Use bary_unpack.
  (roomof): Defined.
  (bdigit_roomof): Defined.
  (BARY_ARGS): Defined.
  (bary_unpack): Declared.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41312 b2dd03c8-39d4-4d8f-98ff-823fe69b080e