[PATCH][libstdc++-v3 parallel mode] Correct part lengths calculation for parallel partial_sum

[Johannes Singler]

This patch corrects the calculation of the part lengths for parallel
partial_sum, leading to the expected behavior for
partial_sum_dilation!=1, and thus better performance.

Tested x86_64-unknown-linux-gnu: No regressions.

Please approve for mainline.

2010-06-08  Johannes Singler  <singler@kit.edu>

        * include/parallel/partial_sum.h
        (__parallel_partial_sum_linear):
        Correctly calculate part lengths for partial_sum_dilation!=1.

Johannes

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