[PATCH][libstdc++-v3 parallel mode] Fix memory leaks in multiway_merge

[Johannes Singler]

This patch fixes two memory leaks (and non-called destructors) in
multiway_merge.

Tested x86_64-unknown-linux-gnu: No regressions

Please approve for mainline and gcc-4_4-branch.

2009-09-10  Johannes Singler  <singler@ira.uka.de>

        * include/parallel/multiway_merge.h
       (multiway_merge_exact_splitting): Deallocate borders correctly.
       (parallel_multiway_merge): Remove unnecessarily complicated
       allocation, random access iterators are default-constructible.

       Deallocate ne_seqs correctly.

Johannes
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