Revert "[llvm][NFC] Use c++17 style variable type traits"

This reverts commit 1834a310d060d55748ca38d4ae0482864c2047d8.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/unittests/ExecutionEngine/Orc/SimplePackedSerializationTest.cpp b/llvm/unittests/ExecutionEngine/Orc/SimplePackedSerializationTest.cpp
index 6c441a3..ee73614 100644
--- a/llvm/unittests/ExecutionEngine/Orc/SimplePackedSerializationTest.cpp
+++ b/llvm/unittests/ExecutionEngine/Orc/SimplePackedSerializationTest.cpp
@@ -67,7 +67,7 @@ static void spsSerializationRoundTrip(const T &Value) {
 template <typename T> static void testFixedIntegralTypeSerialization() {
   spsSerializationRoundTrip<T, T>(0);
   spsSerializationRoundTrip<T, T>(static_cast<T>(1));
-  if (std::is_signed_v<T>) {
+  if (std::is_signed<T>::value) {
     spsSerializationRoundTrip<T, T>(static_cast<T>(-1));
     spsSerializationRoundTrip<T, T>(std::numeric_limits<T>::min());
   }