* bignum.c: (bigsub_core): Use bary_sub.

  (bary_sub): Returns a borrow flag.  Use bary_subb.
  (bary_subb): New function for actually calculating subtraction with
  borrow.
  (bary_sub_one): New function.
  (bigadd_core): Use bary_add.
  (bary_add): Returns a carry flag.  Use bary_addc.
  (bary_addc): New function for actually calculating addition with
  carry.
  (bary_add_one): New function.
  (bary_muladd_1xN): Extracted from bary_mul_normal.
  (bigmul1_normal): Removed.
  (bary_mul_karatsuba): New function.
  (bary_mul1): Invoke rb_thread_check_ints after bary_mul_normal.
  (bary_mul): Remove most and least significant zeros before actual
  multiplication.  Use bary_sq_fast, bary_mul_balance,
  bary_mul_karatsuba and bigmul1_toom3 as bigmul0.
  (bigmul1_balance): Removed.
  (bigmul1_karatsuba): Removed.
  (bigsqr_fast): Removed.
  (bary_sparse_p): Extracted from big_sparse_p.
  (big_sparse_p): Removed.
  (bigmul0): Use bary_mul.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41821 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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