Hide _S_n_primes from user code

[Marek Polacek]

On Wed, Apr 22, 2015 at 09:39:48PM +0200, François Dumont wrote:
> Hello
> 
>     Here is a rather trivial patch, just code cleanup. Since we export
> _Prime_rehash_policy we do not need to expose the _S_n_primes anymore.
> 
>     * include/bits/hashtable_policy.h (_Prime_rehash_policy::_S_n_primes):
>     Delete.
>     * src/c++11/hashtable_c++0x.cc (_Prime_rehash_policy::_M_next_bkt):
>     Remove usage of latter and compute size of the prime numbers array
>     locally.
> 
> Tested under Linux x86_64.
> 
> Ok to commit ?

The patch is missing :).

	Marek