Louis Dionne 849e749d7f [libc++][NFC] Remove several redundant #if _LIBCPP_STD_VER > 17 in <span>
It turns out that the whole header is only enabled in C++20 and above,
so these checks were redundant (and always true).

Differential Revision: https://reviews.llvm.org/D121604
2022-03-14 13:53:30 -04:00
..