[Bug c/90885] GCC should warn about 2^16 and 2^32 and 2^64 [-Wxor-used-as-pow]

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90885

--- Comment #29 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Excellent! Thanks, Dave