Fix code regression

[François Dumont]

Hi

     I detect this regression while running performance tests. I think 
it comes from:

2012-04-12  Benjamin Kosnik  <bkoz@redhat.com>

     * include/bits/unordered_map.h (__unordered_map): Remove.
     (__unordered_multimap): Remove.
     Add aliases for __umap_traits, __umap_hashtable, __ummap_traits,
     __ummap_hashtable.
     (unordered_map): Derive from __umap_hashtable.
     (unordered_multimap): Derive from __ummap_hashtable.
     * include/bits/unordered_set.h (__unordered_set): Remove.
     (__unordered_multiset): Remove.
     ...

2012-09-19  François Dumont  <fdumont@gcc.gnu.org>

     * testsuite/performance/23_containers/insert_erase/41975.cc: Use
     __uset_hashtable rather than now missing __unordered_set.

Ok to commit ?

François

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