[Bug libstdc++/101485] Calling std::equal with std::byte* does not use memcmp

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101485

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We can use is_same_v<_ValueType1, byte> instead, which is more efficient to
compile than instantiating __is_byte unconditionally.