[libc++][NFC] Remove several redundant #if _LIBCPP_STD_VER > 17 in <span>
authorLouis Dionne <ldionne.2@gmail.com>
Mon, 14 Mar 2022 15:36:21 +0000 (11:36 -0400)
committerLouis Dionne <ldionne.2@gmail.com>
Mon, 14 Mar 2022 17:53:30 +0000 (13:53 -0400)
commit849e749d7f82cba44bccf6261239139bc9019754
treee8f3df04b1b9d96c7a165f6f1aaa9e0d9caab024
parent294eca35a00f89dff474044ebd478a7f83ccc310
[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
libcxx/include/span