Update lib/Interpreter/CppInterOp.cpp

Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com>

Author: mcbarton

lib/Interpreter/CppInterOp.cpp

@@ -2880,7 +2880,7 @@ namespace Cpp {
       Template_Deduction_Result Result = S.DeduceTemplateArguments(
           FunctionTemplate, &TLI, Specialization, Info,
           /*IsAddressOfFunction*/ true);
-      if (static_cast<int>(Result)) {
+      if (Result != TemplateDeductionResult::Success) {
         // FIXME: Diagnose what happened.
         (void)Result;
       }