[Bug libstdc++/47433] libstdc++ parallel mode calls std::swap explicitely

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47433

--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-01-24 14:11:05 UTC ---
Thanks Johannes. Jon is right (and indeed we are already using the pattern
elsewhere): when we are removing the std:: qualification from std::swap inside
a namespace != std, let's also add an using std::swap before. Maybe isn't
really necessary due to namespace association, but let's play safe. Patch
pre-approved.