Profile mode maintenance patch

["François Dumont" <frs.dumont@gmail.com>]

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Hi

     Here is the promise major patch for the profile mode. Here are the 
most important modifications.

     Now instance of profiling structs are kept as pointers in the 
containers themselves. It has an impact on the container ABI but it 
greatly enhance performances as we do not need to move through a search 
in an unordered container which also imply a lock during this research. 
I have even been able to remove those unordered containers eventually 
just keeping a counter of allocated bytes to know if we should stop 
creating new profiling structs.

     I get rid of the re-entrancy mechanism. The only reason for it was 
a potential hook in the memory allocator potentially creating new 
profiling structs and so long forever. I prefer to put it just where it 
is necessary that is to say when we first allocate memory for profiling 
which is then we create the back-trace.

     I wonder if we shouldn't emit a #error when trying to activate 
profiling mode without backtrace feature cause in this case we simply 
won't collect anything.

     I finalize ordered to unordered profiling by adding the missing 
__iterator_tracker on the ordered containers (map, multimap, set, multiset).

     I clean all useless stuff like __stack_info_base class.

     I fixed many memory leak and added a cleanup at exit of the 
application.

     Profiling of containers is reseted as soon as one of the following 
operations occur: copy assignment, move assignment, initialization from 
an initialization list, clear.

     I have added usage of atomic operations to maintain some counters 
that might be updated from different threads. Do not hesitate to review 
those closely. Especially __objects_byte_size which I am using in 
profiler_trace.h without atomic operation, is it fine ?

     With all those modifications I have been able to run all testsuite 
in profile mode with success.

     Ok to commit ?

François


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