* bignum.c (BDIGITS_ZERO): Defined.
  (bary_pack): Use BDIGITS_ZERO.
  (bary_unpack): Ditto.
  (bary_mul_single): Ditto.
  (bary_mul_normal): Ditto.
  (bary_sq_fast): Ditto.
  (bary_mul_balance_with_mulfunc): Ditto.
  (bary_mul_precheck): Ditto.
  (bary_mul_toom3_branch): Ditto.
  (rb_cstr_to_inum): Ditto.
  (big_shift3): Ditto.
  (bigmul1_toom3): Ditto.
  (bary_divmod): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42032 b2dd03c8-39d4-4d8f-98ff-823fe69b080e