[Bug libstdc++/88111] libstdc++-v3 FTB for 16-bit int: memory_resource.cc pool_sizes expects >16-bit int/size_t

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88111

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Or just +__x instead of (__x + 0).

I'm assuming that the non-standard integer type will promote to one of the
standard integers, which is true for __int20 but maybe not in general.