[PATCH] PR 107189 Remove useless _Alloc_node

[François Dumont]

     libstdc++: Remove _Alloc_node instance in _Rb_tree [PR107189]

     libstdc++-v3/ChangeLog:

             PR libstdc++/107189
             * include/bits/stl_tree.h 
(_Rb_tree<>::_M_insert_range_equal): Remove
             unused _Alloc_node instance.

Ok to commit ?

François
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