A counting for loop without an initializer that opened a function body
   placed its condition at bytecode offset 0, which the compiler mistook
   for an absent condition. The loop then never jumped back to the test
   and kept running after the condition had turned false.
   
   -- Testcase --
   {%
           function count_down(n) {
                   for (; n > 0; n--) {
                          if (n < -2)
                                  return "runaway";
  
                          print(n, "\n");
                  }
  
                  return "done";
          }
  
          function walk(n) {
                  for (; n > 1; n = int(n / 2))
                          if (n == 0)
                                  return "runaway";
  
                  return n;
          }
  
          print(count_down(3), "\n");
          print(walk(8), "\n");
  %}
  -- End --
  
  -- Expect stdout --
  3
  2
  1
  done
  1
  -- End --

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