[Bug libstdc++/118681] [C++17] unsynchronized_pool_resource may fail to respect alignment

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118681

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
synchronized_pool_resource::do_allocate has the similar code but with a lock
for the pool case.