[libc++][atomic_ref] add missing header include for uintptr_t caught by hardening mode CI builds

dalg24 · dalg24 · commit b5d55f261c68 · 2024-01-05T17:48:42.000-05:00
diff --git a/libcxx/include/__atomic/atomic_ref.h b/libcxx/include/__atomic/atomic_ref.h
@@ -27,6 +27,7 @@
 #include <__type_traits/is_same.h>
 #include <__type_traits/is_trivially_copyable.h>
 #include <cstddef>
+#include <cstdint>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
