- keep der(var) = const

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@13532 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: Jens Frenkel

Compiler/BackEnd/BackendVariable.mo

@@ -4050,7 +4050,8 @@ algorithm
     case DAE.CREF_QUAL(ident = "$ZERO") then true;
     case DAE.CREF_QUAL(ident = "$_DER") then true;
     case DAE.CREF_QUAL(ident = "$pDER") then true;
-    case DAE.CREF_QUAL(ident = "$DER") then true;
+    // keep same a while untill we know which are needed  
+    //case DAE.CREF_QUAL(ident = "$DER") then true;
     else then false;
   end match;
 end selfGeneratedVar;