add type_traits include as required for std::integral_constant

diff --git a/libcxx/include/typeinfo b/libcxx/include/typeinfo
index 2760176..74813cc 100644 (file)
--- a/libcxx/include/typeinfo
+++ b/libcxx/include/typeinfo
@@ -60,6 +60,7 @@ public:
 #include <exception>
 #include <cstddef>
 #include <cstdint>
+#include <type_traits>
 #ifdef _LIBCPP_NO_EXCEPTIONS
 #include <cstdlib>
 #endif