[Bug ada/80117] Standard'Word_Size is wrong for aarch64 ILP32

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80117

--- Comment #11 from Andreas Schwab <schwab@linux-m68k.org> ---
So what's a word then?  Obviously, UNITS_PER_WORD does not fit.