Fix code regression

[François Dumont]

Hi

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

2012-04-12  Benjamin Kosnik  <b...@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  <fdum...@gcc.gnu.org>

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

Ok to commit ?

François

Index: testsuite/performance/23_containers/insert_erase/41975.cc
===================================================================
--- testsuite/performance/23_containers/insert_erase/41975.cc	(revision 191279)
+++ testsuite/performance/23_containers/insert_erase/41975.cc	(working copy)
@@ -40,8 +40,9 @@
       const int nb = 200000;
       start_counters(time, resource);
 
-      std::__unordered_set<int, std::hash<int>, std::equal_to<int>,
-			   std::allocator<int>, use_cache> us;
+      std::__uset_hashtable<int, std::hash<int>, std::equal_to<int>,
+			    std::allocator<int>,
+			    std::__uset_traits<use_cache>> us;
       for (int i = 0; i != nb; ++i)
 	us.insert(i);
 
@@ -125,9 +126,10 @@
 
       start_counters(time, resource);
 
-      std::__unordered_set<std::string, std::hash<std::string>,
-			   std::equal_to<std::string>,
-			   std::allocator<std::string>, use_cache> us;
+      std::__uset_hashtable<std::string, std::hash<std::string>,
+			    std::equal_to<std::string>,
+			    std::allocator<std::string>,
+			    std::__uset_traits<use_cache>> us;
       for (int i = 0; i != nb; ++i)
 	us.insert(strs[i]);