src: simplify enable_if logic of ToStringHelper::BaseConvert

PR-URL: #44306
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

src/debug_utils-inl.h

@@ -29,7 +29,7 @@ struct ToStringHelper {
   static std::string Convert(bool value) { return value ? "true" : "false"; }
   template <unsigned BASE_BITS,
             typename T,
-            typename std::enable_if<std::is_integral<T>::value, int>::type = 0>
+            typename = std::enable_if_t<std::is_integral_v<T>>>
   static std::string BaseConvert(const T& value) {
     auto v = static_cast<uint64_t>(value);
     char ret[3 * sizeof(T)];
@@ -45,7 +45,7 @@ struct ToStringHelper {
   }
   template <unsigned BASE_BITS,
             typename T,
-            typename std::enable_if<!std::is_integral<T>::value, int>::type = 0>
+            typename = std::enable_if_t<!std::is_integral_v<T>>>
   static std::string BaseConvert(T value) {
     return Convert(std::forward<T>(value));
   }