Optimization: Only preserve exception in except/finally handlers.
Optimization: Only preserve exception in except/finally handlers.

* This should make yielding from try blocks faster. Only the ones in
  handlers needs the extra code.

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