[Bug libstdc++/57916] Improve std::sort partitioning by explicitly employing the pivot

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57916

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Alexey I sent you the questionnaire on July, 21st. Did you get it?