Cleanup
Cleanup

* More elegant way of handling the loop node body potentially becoming
  empty when terminal "continue" statements are stripped.

* Also improved trace messages for break and continue related
  optimization.

tempbottle/Nuitka,tempbottle/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka,tempbottle/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka,kayhayen/Nuitka,tempbottle/Nuitka,wfxiang08/Nuitka