[libc++] Mark standard-mandated includes as such
Reviewed By: ldionne, Mordante, #libc, saugustine
Spies: saugustine, MaskRay, arichardson, mstorsjo, jloser, libcxx-commits, arphaman
Differential Revision: https://reviews.llvm.org/D127953
NOKEYCHECK=True
GitOrigin-RevId: db1978b67431ca3462ad8935bf662c15750b8252
diff --git a/include/valarray b/include/valarray
index 23c07fa..5e60175 100644
--- a/include/valarray
+++ b/include/valarray
@@ -357,10 +357,12 @@
#include <__utility/swap.h>
#include <cmath>
#include <cstddef>
-#include <initializer_list>
#include <new>
#include <version>
+// standard-mandated includes
+#include <initializer_list>
+
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif