[v3] fix libstdc++/53263

[François Dumont]

Here is a patch for PR 53263.

I have also generalize the idea of performing checks on unsafe iterators 
for better performance to several other debug checks.

2012-05-09  François Dumont <fdumont@gcc.gnu.org>

     PR libstdc++/53263
     * include/debug/safe_iterator.h (__gnu_debug::__base): Move...
     * include/debug/functions.h: ... Here. Add debug function
     overloads to perform checks on normal iterators when possible.
     * include/debug/macros.h (__glibcxx_check_heap,
     __glibcxx_check_heap_pred): Use __gnu_debug::__base on iterator range.


Tested under linux x86_64 debug mode.

Ok for trunk and 4.7 branch ?

François

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