[Bug libstdc++/47354] bitmap_allocator free_list::_M_get never locks mutex

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47354

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-01-18 
23:46:01 UTC ---
I wouldn't be surprised if that code has bit-rotted, I'll check it out now ...