* bignum.c (bary_neg): Extracted from bary_2comp.
  (bary_plus_one): Extracted from bary_2comp.
  (bary_2comp): Use bary_neg and bary_plus_one.
  (big_extend_carry): Extracted from get2comp.
  (get2comp): Use big_extend_carry.
  (rb_integer_unpack): Use big_extend_carry.
  (rb_big_neg): Use bary_neg.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41695 b2dd03c8-39d4-4d8f-98ff-823fe69b080e