hash policy patch

[François Dumont]

Hi

     While working on DR 41975 I realized a small issue in current 
rehash implementation that sometimes lead to load_factor being greater 
than max_load_factor. Here is a patch to fix that:

2011-07-23  François Dumont <francois.cppdevs@free.fr>

         * include/bits/hashtable_policy.h (_Prime_rehash_policy): Use
         __builtin_floor rather than __builtin_ceil to compute next resize
         value.
         * testsuite/23_containers/unordered_set/hash_policy/load_factor.cc:
         New.

François
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