The attributes of a pre-var is the same as the var

Belonging to [master]:
  - OpenModelica/OMCompiler#2097
  - OpenModelica/OpenModelica-testsuite#814

Compiler/FrontEnd/ComponentReference.mo

@@ -2078,6 +2078,15 @@ algorithm
   outCref := makeCrefQual(DAE.previousNamePrefix, DAE.T_UNKNOWN_DEFAULT, {}, inCref);
 end crefPrefixPrevious;
 
+public function crefRemovePrePrefix
+  input output DAE.ComponentRef cref;
+algorithm
+  cref := match cref
+    case DAE.CREF_QUAL(ident=DAE.preNamePrefix) then cref.componentRef;
+    else cref;
+  end match;
+end crefRemovePrePrefix;
+
 public function crefPrefixStart "public function crefPrefixStart
   Appends $START to a cref, so a => $START.a"
   input DAE.ComponentRef inCref;

Compiler/Template/CodegenCFunctions.tpl

@@ -6984,7 +6984,7 @@ end varAttributes;
 
 template crefAttributes(ComponentRef cr)
 ::=
-  match cref2simvar(cr, getSimCode())
+  match cref2simvar(crefRemovePrePrefix(cr), getSimCode())
   case var as SIMVAR(index=-1, varKind=JAC_VAR()) then "dummyREAL_ATTRIBUTE"
   case var as SIMVAR(__) then
     if intLt(index,0) then error(sourceInfo(), 'varAttributes got negative index=<%index%> for <%crefStr(name)%>') else

Compiler/Template/SimCodeTV.mo

@@ -3244,6 +3244,10 @@ package ComponentReference
     output DAE.ComponentRef outCR;
   end popCref;
 
+  function crefRemovePrePrefix
+    input DAE.ComponentRef inCR;
+    output DAE.ComponentRef outCR;
+  end crefRemovePrePrefix;
 end ComponentReference;
 
 package Expression