Export _Prime_rehash_policy symbols

[François Dumont]

Hi

     This long standing issue has been reported to my attention by Paolo 
some weeks ago. This is the patch to export _Prime_rehash_policy symbols.

2013-01-29  François Dumont  <fdumont@gcc.gnu.org>

     * include/bits/hashtable_policy.h
     (_Prime_rehash_policy::_M_next_bkt)
     (_Prime_rehash_policy::_M_need_rehash): Move definition...
     * src/c++11/hashtable_c++0x.cc: ... here.
     * config/abi/gnu.ver (GLIBCXX_3.4.18): Export _Prime_rehash_policy
     symbols.

     Tested under Linux x86_64.

     Ok for trunk ?

     I also notice a weird thing in hashtable_c++0x.cc. It is including 
shared/hashtable-aux.cc within namespace std scope. However 
hashtable-aux.cc includes <bits/config.h> itself. If hashtable_c++0x.cc 
was not including <bits/config.h> it would fail to compile. Do you want 
me to remove <bits/config.h> include from shared/hashtable-aux.cc at the 
same time ?

François
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