[PATCH][libstdc++-v3 parallel mode] multiway_merge fixes

[Benjamin Kosnik]

> 2008-05-02  Johannes Singler  <singler@ira.uka.de>
> 
>           * include/parallel/multiway_merge.h:
>             (multiway_merge_*_unguarded):
>             Pass sentinel directly, to allow correct determination.
>             (multiway_merge_loser_tree_unguarded):
>             Remove over-cautious assertion.
>             (calls to multiway_merge_*_splitting):
>             Parametrize with type that is correct in all cases.
>           * include/parallel/losertree.h:
>             (delete_min_insert (in many classes)):
>             Correct and standardize assertions.


This is fine.

-benjamin