debug mode patch

[François Dumont]

Hi

     Here is a proposition of a patch to a minor issue in debug string 
and to remove a useless debug check on heap. Ok ?

2011-02-19  François Dumont <francois.cppdevs@free.fr>

         * include/debug/string (basic_string::insert): Add iterator 
check and
         pass normal iterator to normal insert.
         * include/debug/macros.h (__glibcxx_check_heap,
         __glibcxx_check_heap_pred): Remove __glibcxx_check_valid_range,
         already done.

Regards

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