[PATCH] Fix tests sensitive to internal library allocations

[François Dumont]

Hi

Here is a propocal to fix tests sensitive to libstdc++ internal allocations.

Tested by restoring allocation in tzdb.cc.

As announced I'm also adding a test to detect such allocations. If it is 
ok let me know if you prefer to see it in a different place.

     libstdc++: Fix tests relying on operator new/delete overload

     Fix tests that are checking for an allocation plan. They are failing if
     an allocation is taking place outside the test.

     libstdc++-v3/ChangeLog

             * testsuite/util/replacement_memory_operators.h
             (counter::_M_pre_enter_count): New.
             (counter::enter, counter::exit): New static methods to call 
on main() enter/exit.
             * testsuite/23_containers/unordered_map/96088.cc (main):
             Call __gnu_test::counter::enter/exit.
             * testsuite/23_containers/unordered_multimap/96088.cc 
(main): Likewise.
             * testsuite/23_containers/unordered_multiset/96088.cc 
(main): Likewise.
             * testsuite/23_containers/unordered_set/96088.cc (main): 
Likewise.
             * testsuite/ext/malloc_allocator/deallocate_local.cc 
(main): Likewise.
             * testsuite/ext/new_allocator/deallocate_local.cc (main): 
Likewise.
             * testsuite/ext/throw_allocator/deallocate_local.cc (main): 
Likewise.
             * testsuite/ext/pool_allocator/allocate_chunk.cc (started): 
New global.
             (operator new(size_t)): Check started.
             (main): Set/Unset started.
             * testsuite/ext/no_library_allocation.cc: New test case.

Ok to commit ?

François
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