Ruby

• bignum.c (bary_add): New function.
  (bary_zero_p): Extracted from bigzero_p.
  (absint_numwords_generic): Use bary_zero_p and bary_add.
  (bary_mul): Fix an argument for bary_mul_single.
  (bary_divmod): Use size_t for arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41328 b2dd03c8-39d4-4d8f-98ff-823fe69b080e