[Bug libstdc++/78552] std::locale::classic() Needless Race

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78552

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.0                        |8.4

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also fixed for 8.4 and 9.3