array bindings need to be handled better in the compiler

[Martin Sjölund]

  class ArrayCall
    function fn
      input Real r;
      output Real array[10];
    algorithm
      array := 1:10.0;
      array := cos(r*array);
    end fn;
    Real x[10] = fn(time);
  end ArrayCall;

Either we do common subexpression elimination in the backend or keep the arrays non-expanded. Common subexpression elimination would of course be preferrable as then we could do things like:

class ArrayCall
  Real x[10] = fn(time);
  Real y[10] = fn(time)*2;
  Real z[10] = fn(time)*3;
end ArrayCall;

And only call fn once. We probably need to introduce temporary variables to deal with duplicated function calls.

[Martin Sjölund]

The binding x = fn(time) could be moved into the equation-section, which avoids some of these issues.

[Martin Sjölund]

We now move the binding into the equation section.