use make_shared to create singleton (#1004)

Summary:
Hi, this change fixes a compiler-related issue in our internal environment.

`make_shared` is recommended over `std::shared_ptr(new)`. Although it's not broken in the open-source version, I still believe it is valuable to merge this change.

Pull Request resolved: #1004

Reviewed By: sraikund16

Differential Revision: D64775478

Pulled By: briancoutinho

fbshipit-source-id: 48b9bceace195de8fccc8f3ace9481e761641bb6

libkineto/src/CuptiCallbackApi.cpp

@@ -160,7 +160,7 @@ void CuptiCallbackApi::__callback_switchboard(
 std::shared_ptr<CuptiCallbackApi> CuptiCallbackApi::singleton() {
   static const std::shared_ptr<CuptiCallbackApi> instance = [] {
     std::shared_ptr<CuptiCallbackApi> inst =
-        std::shared_ptr<CuptiCallbackApi>(new CuptiCallbackApi());
+        std::make_shared<CuptiCallbackApi>();
     return inst;
   }();
   return instance;