* internal.h (rb_big_mul_normal): Declared.
  (rb_big_mul_balance): Ditto.
  (rb_big_mul_karatsuba): Ditto.

* bignum.c (rb_big_mul_normal): New function for tests.
  (rb_big_mul_balance): Ditto.
  (rb_big_mul_karatsuba): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41824 b2dd03c8-39d4-4d8f-98ff-823fe69b080e