• bignum.c (bary_mul): New function.
  (absint_numwords_generic): Use bary_mul.
  (bary_mul_single): Extracted from bigmul1_single.
  (bary_mul_normal): Extracted from bigmul1_normal.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41313 b2dd03c8-39d4-4d8f-98ff-823fe69b080e