SIL: Fix a call to ProtocolConformanceRef::forAbstract()

Author: slavapestov

lib/SIL/Parser/ParseSIL.cpp

@@ -1884,8 +1884,7 @@ SubstitutionMap getApplySubstitutionsFromParsed(
                       proto->getDeclaredInterfaceType());
         failed = true;
 
-        // FIXME: Passing an empty Type() here temporarily.
-        return ProtocolConformanceRef::forAbstract(Type(), proto);
+        return ProtocolConformanceRef::forInvalid();
       });
 
   return failed ? SubstitutionMap() : subMap;