Issue 1179: Actions do not move the program counter after Step Into if breakpoint is on first line of function

Steps to reproduce

  1. Open Firebug, enable the Script panel and reload the page.
  2. Create a breakpoint on line 11
  3. Refresh this page
  4. Debugger should halt at line 11
  5. Step Over should go to line 12
  6. Another Step Over should resume the debugger
  7. Refresh this page
  8. Debugger should halt at line 11
  9. Press continue to resume the debugger
  10. Debugger should be resumed