Add equation size to vectorized equalities and for loops

Belonging to [master]:
  - OpenModelica/OMCompiler#2738
  - OpenModelica/OpenModelica-testsuite#1060

Author: rfranke

Compiler/BackEnd/BackendEquation.mo

@@ -1664,7 +1664,6 @@ algorithm
   osize := match eq
     local
       list<Integer> ds;
-      DAE.Exp e1, e2;
       Integer size, start, stop;
       list<BackendDAE.Equation> eqnsfalse;
 
@@ -1694,14 +1693,8 @@ algorithm
       size = equationLstSize(eqnsfalse);
     then size;
 
-    case BackendDAE.FOR_EQUATION(start = e1, stop = e2) equation
-      if Flags.isSet(Flags.NF_SCALARIZE) then
-        DAE.ICONST(start) = e1;
-        DAE.ICONST(stop) = e2;
-        size = stop - start + 1;
-      else
-        size = 1;
-      end if;
+    case BackendDAE.FOR_EQUATION(start = DAE.ICONST(start), stop = DAE.ICONST(stop)) equation
+      size = stop - start + 1;
     then size;
 
     else equation

Compiler/NFFrontEnd/NFFlatten.mo

@@ -635,8 +635,8 @@ algorithm
       Integer stop;
       Expression range;
     case Equation.EQUALITY(lhs = Expression.CREF(), rhs = Expression.CREF())
-      // let simple equality as is
-      then eqn;
+      // convert simple equality of crefs to array equality
+      then Equation.ARRAY_EQUALITY(eqn.lhs, eqn.rhs, Type.liftArrayLeftList(eqn.ty, dimensions), eqn.source);
     else
       // wrap general equation into for loop
       algorithm