[Bug libstdc++/46914] std::atomic::exchange(...) doesn't store correct value.

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46914

--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-01-27 
15:58:19 UTC ---
Likewise for 4_5-branch.