[libc++] Add missing include to three_way_comp_ref_type.h

ldionne · ldionne · commit 0df78123fdae · 2024-08-27T14:22:49.000-04:00
We were using a `_LIBCPP_ASSERT_FOO` macro without including `&lt;__assert&gt;`.

rdar://134425695
diff --git a/libcxx/include/__algorithm/three_way_comp_ref_type.h b/libcxx/include/__algorithm/three_way_comp_ref_type.h
@@ -9,6 +9,7 @@
 #ifndef _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
 #define _LIBCPP___ALGORITHM_THREE_WAY_COMP_REF_TYPE_H
 
+#include <__assert>
 #include <__compare/ordering.h>
 #include <__config>
 #include <__utility/declval.h>
