[PATCH][libstdc++-v3 parallel mode] Enable user-defined swap

[Johannes Singler]

The following patch enables user-defined swap for parallel sorting and 
the like, which can improve performance.

Tested x86_64-unknown-linux-gnu: No regressions

Pre-approved for mainline.
Also commit to gcc-4_5-branch?

2011-01-24  Johannes Singler  <singler@kit.edu>

         PR libstdc++/47433
         * include/parallel/losertree.h
         (_LoserTree<>::__delete_min_insert):
         Do not qualify swap with std:: for value type,
         but include a using directive instead.
         (_LoserTreeUnguarded<>::__delete_min_insert): Likewise.
         * include/parallel/balanced_quicksort.h (__qsb_divide):
         Use std::iter_swap instead of std::swap.
         (__qsb_local_sort_with_helping): Likewise.
         * include/parallel/partition.h (__parallel_partition):
         Likewise. (__parallel_nth_element): Likewise.

Johannes

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