[Bug c++/90885] GCC should warn about 2^16 and 2^32 and 2^64

[david.bolvansky at gmail dot com]

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

--- Comment #20 from Dávid Bolvanský <david.bolvansky at gmail dot com> ---
Clang implemented [0] this diagnostic under -Wxor-used-as-pow.
From user perspective it would be reasonable if GCC follows this naming.

[0] https://reviews.llvm.org/D63423