Fix include order

Author: var-const

libcxx/include/bitset

@@ -132,8 +132,8 @@ template <size_t N> struct hash<std::bitset<N>>;
 #  include <__algorithm/fill.h>
 #  include <__algorithm/fill_n.h>
 #  include <__algorithm/find.h>
-#  include <__bit_reference>
 #  include <__assert>
+#  include <__bit_reference>
 #  include <__config>
 #  include <__functional/hash.h>
 #  include <__functional/unary_function.h>