sieve: use the hardcoded sieve for "small" primes.
sieve: use the hardcoded sieve for "small" primes.

Antiarchitect/primal,huonw/primal,cuviper/primal,wackywendell/primal,cuviper/primal,Antiarchitect/primal,huonw/primal,wackywendell/primal