debug abi breaking change patch

[François Dumont]

Hi

     Even if not yet officially documented, I am working on it, a new 
libstdc++-v3 branch has been created:

libstdcxx_so_7-2-branch

     This branch purpose is to receive all abi breaking changes that 
can't be pushed into the trunk for the moment.

     So here is the first patch I would like to commit in it. It removes 
the pool of mutexes relying in the library and associates a mutex to 
each debug sequence. A little more memory consumed but no contention 
when threads are playing with distinct debug sequences.

2012-02-08  François Dumont <fdumont@gcc.gnu.org>

         * include/debug/safe_base.h (_Safe_iterator_base::_M_get_mutex):
         Remove. (_Safe_sequence_base::_M_get_mutex): Remove and replace
         with _M_mutex.
         * include/debug/safe_sequence.tcc, safe_unordered_container.tcc,
         forward_list: Adapt to use _M_mutex rather than _M_get_mutex.
         * src/c++11/debug.cc: Adapt to use
         _M_mutex. (anonymous::get_safe_base_mutex): Remove.

Tested under x86_64 linux. Do you agree to push it into the branch ?

François

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