[Bug sanitizer/59215] tsan: warning in shared_ptr_base.h

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59215

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> tsan as well, but the point is till ...

s/till/still/