Expected result for preservation of for loops

Belonging to [master]:
  - OpenModelica/OMCompiler#2685
  - OpenModelica/OpenModelica-testsuite#1042

flattening/modelica/scodeinst/VectorTest.mo

@@ -76,16 +76,9 @@ end VT;
 //   output Real y2;
 // equation
 //   when Clock() then
-//     x1[1] = previous(x1[1]) + u[1];
-//     x1[2] = previous(x1[2]) + u[2];
-//     x1[3] = previous(x1[3]) + u[3];
-//     x1[4] = previous(x1[4]) + u[4];
-//     x1[5] = previous(x1[5]) + u[5];
-//     x1[6] = previous(x1[6]) + u[6];
-//     x1[7] = previous(x1[7]) + u[7];
-//     x1[8] = previous(x1[8]) + u[8];
-//     x1[9] = previous(x1[9]) + u[9];
-//     x1[10] = previous(x1[10]) + u[10];
+//     for i in 1:10 loop
+//       x1[i] = previous(x1[i]) + u[i];
+//     end for;
 //     x2 = VectorTest.myfor(u, previous(x2));
 //   end when;
 //   y0 = sum(u);